Mary Brown’s Big Mary Sandwich Recipe

This Mary Brown’s Big Mary Sandwich brings the iconic Canadian fast-food favorite straight into your home kitchen. It features a juicy buttermilk-marinated chicken breast with a seasoned flour-cornstarch coating that fries up impossibly crunchy and golden, all stacked on a toasted brioche bun with fresh toppings.

Total time runs about 50 minutes with 30 minutes of active prep, and I rate this at an intermediate level — not because the technique is hard, but because managing the double-breading and oil temperature takes a little focus. It’s perfect for game day, weekend lunches, or any time you want a truly satisfying fried chicken sandwich.

Why You’ll Love This Recipe

• Authentic crunch — The cornstarch in the breading creates that signature shatteringly crisp crust that holds up even after assembly.
• Perfectly tender chicken — A long buttermilk soak tenderizes the meat from the inside out, so every bite stays moist and juicy.
• Better than takeout — You control the seasoning, the oil freshness, and the temperature, which means a sandwich that tastes noticeably fresher than drive-through versions.

What Makes This Recipe Special

This recipe nails the balance between a craggy, golden crust and a tender, seasoned interior — something many homemade fried chicken sandwiches miss. The double-dredge method creates those nooks and crannies that trap flavor and stay crunchy even after a few minutes under the toppings. It’s a sandwich built for immediate satisfaction, ideal for a weekend cook or a celebration meal where you want something extra.

Ingredients You’ll Need

For the Chicken and Marinade

• 4 boneless skinless chicken breasts (6 oz / 170 g each) — Pound them to even thickness so they cook uniformly and stay tender; avoid tearing the meat.
• 1 cup buttermilk — The acid gently tenderizes the chicken and adds a subtle tang that balances the rich crust.
• 1 tbsp hot sauce (optional) — Adds a mild heat that builds during frying; leave it out if you prefer zero spice.

For the Breading

• 1 cup all-purpose flour — Forms the structure of the crust and helps the seasonings adhere.
• ¼ cup cornstarch — The key to extra crispiness; it lightens the coating and prevents a dense, bready texture.
• 1 tbsp paprika — Provides color and a mild smoky note that defines the signature appearance.
• 1 tsp garlic powder — Adds savory depth without overpowering the chicken.
• 1 tsp onion powder — Rounds out the savory profile with a subtle sweetness.
• 1 tsp cayenne pepper (adjust to taste) — Controls the heat level; use the full teaspoon for noticeable spice or cut it in half for a milder sandwich.
• 1 tsp kosher salt — Seasons the coating from the outside in; don’t skip it or the crust will taste flat.
• ½ tsp black pepper — Adds a gentle warmth that complements the paprika and cayenne.

For the Egg Wash and Frying

• 2 large eggs — Beaten with water to create a tacky surface that grabs the second layer of breading.
• 4 cups vegetable oil (for frying; about 2 tbsp absorbed per serving) — Use a neutral oil with a high smoke point like canola or peanut; maintain 350°F for best results.

For Assembly

• 4 brioche buns, split — Their soft, buttery crumb contrasts perfectly with the crunchy chicken; toast them for structure.
• 4 leaves green leaf lettuce — Provides a fresh, crisp layer that prevents the bun from getting soggy.
• 1 large tomato, sliced into 4 rounds — Adds juiciness and acidity to cut through the richness.
• ¼ cup mayonnaise — Spread on both bun halves for creaminess and a moisture barrier.
• 8 dill pickle slices (optional) — Their tangy snap brightens every bite; I consider them essential.

Equipment Needed

• Heavy-bottomed pot or Dutch oven — Holds heat steadily and prevents drastic temperature drops when you add the chicken.
• Deep-fry thermometer — The most reliable way to maintain 350°F oil; without one, the crust can burn before the chicken cooks through.
• Tongs — For safely lowering and flipping the chicken in hot oil without splashing.
• Wire rack set over a baking sheet — Holds the breaded chicken before frying and allows excess oil to drain after cooking.
• Instant-read thermometer — Non-negotiable for checking that the internal temperature reaches 165°F / 74°C.

Instructions to Prepare Mary Brown’s Big Mary Sandwich

These steps follow the exact method that gives this sandwich its signature texture and flavor. Take your time with the breading — it makes the difference.

• Pound the chicken — Place each breast between two sheets of plastic wrap and gently pound to an even ½-inch thickness. This ensures uniform cooking; avoid tearing the meat.
• Marinate — Whisk together buttermilk and hot sauce. Submerge the chicken, cover, and refrigerate for at least 4 hours or up to 24 hours. The buttermilk tenderizes while the hot sauce adds subtle heat that builds during frying.
• Mix the breading — Combine flour, cornstarch, paprika, garlic powder, onion powder, cayenne, kosher salt, and black pepper in a shallow dish. Whisk until evenly distributed; the cornstarch boosts crispiness.
• Prepare the egg wash — Beat the eggs with 2 tablespoons water until frothy. This helps the second layer of breading adhere and creates a thick, craggy crust.
• Double-dredge — Remove one breast from the buttermilk, letting excess drip off. Dredge in flour mixture, shake off excess, dip in egg wash, then coat again in flour mixture, pressing firmly. Place on a wire rack. Repeat.
• Heat the oil — Pour oil to a depth of 2 inches in a heavy pot. Heat over medium-high to 350°F / 177°C. Test with a pinch of breading — it should sizzle vigorously and rise quickly.
• Fry in batches — Lower two breasts into the hot oil using tongs. Fry 4 to 5 minutes per side, flipping once, until deep golden brown and the internal temperature reaches 165°F / 74°C. Transfer to a clean wire rack.
• Toast the buns — Toast brioche buns cut-side down in a dry skillet over medium heat for about 1 minute until golden and fragrant, or in a 350°F oven for 3 to 4 minutes.
• Spread the mayonnaise — Spread 1 tablespoon mayonnaise on the cut side of each top and bottom bun. This adds creaminess and prevents sogginess.
• Assemble and serve — Place a lettuce leaf on the bottom bun, followed by a tomato slice. Set the fried chicken on top, add 2 pickle slices if using, and cap with the top bun. Serve immediately while hot.

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Expert Tips for a Standout Mary Brown’s Big Mary Sandwich

• Don’t rush the marinade — Four hours is the minimum; overnight gives noticeably more tender meat. The buttermilk enzymes need time to work.
• Press the final breading firmly — Lightly pressing the flour mixture into the egg wash creates those craggy nooks that turn extra crispy during frying.
• Maintain oil temperature — Let the oil return to 350°F between batches. Adding cold chicken drops the temperature fast, and frying below 325°F makes the crust greasy.
• Rest the chicken after breading — Let the coated breasts sit on the wire rack for 5 minutes before frying. This helps the breading adhere and reduces loose bits in the oil.
• Use a thermometer for doneness — Don’t rely on color alone. The crust can look done while the inside is still undercooked; 165°F is the only reliable sign.
• Toast the buns properly — A dry skillet or oven toast gives the brioche enough structure to hold the juicy chicken without getting soggy or falling apart.
• Assemble right before eating — Even a few minutes of sitting can soften the crust. Have all your toppings ready so you can serve immediately after the last piece comes out of the oil.

Common Mistakes to Avoid

• Skipping the pound step — Uneven chicken thickness means some parts overcook while others stay under. A uniform ½-inch thickness guarantees even cooking.
• Overcrowding the pot — Adding more than two breasts at once drops the oil temperature too low, resulting in a greasy, soggy crust instead of a crisp one.
• Using a wet egg wash that’s too thin — If the egg wash is runny with too much water, the second breading layer won’t adhere properly. Stick to the 2-tablespoon measurement.
• Frying cold chicken straight from the fridge — Cold meat shocks the oil temperature and cooks unevenly. Let the marinated chicken sit at room temperature for 15 minutes before breading and frying.
• Forgetting to drain on a wire rack — Paper towels trap steam and soften the crust. A wire rack lets air circulate, keeping the exterior crispy.
• Assembling too early — The hot chicken creates steam inside the bun. If you build the sandwich more than a couple minutes before eating, the lettuce wilts and the bun gets soft.

Variations & Ways to Customize Mary Brown’s Big Mary Sandwich

• Spicy version — Add an extra teaspoon of cayenne to the flour mixture and mix a tablespoon of hot sauce into the mayonnaise for a fiery kick.
• Honey butter bun — Mix 2 tablespoons softened butter with 1 tablespoon honey and spread on the toasted buns instead of mayonnaise for a sweet-savory twist.
• Coleslaw topping — Swap the lettuce for a tangy coleslaw made with shredded cabbage, carrot, and a vinegar-based dressing for extra crunch and acidity.
• Barbecue style — Brush the fried chicken with your favorite barbecue sauce right after it comes out of the oil, then top with crispy bacon and pickled jalapeños.
• Gluten-free adaptation — Replace the all-purpose flour with a gluten-free 1-to-1 blend and use gluten-free breadcrumbs in place of some of the cornstarch for structure.
• Air fryer method — Spray the breaded chicken with oil and cook in an air fryer at 375°F for 10 to 12 minutes, flipping halfway, though the crust will be slightly less craggy than deep-fried.

What to Serve With Mary Brown’s Big Mary Sandwich

The richness of this sandwich calls for sides that are light, tangy, or crunchy to balance the meal. Here are some favorites.

• Crispy potato wedges — Their hearty texture matches the sandwich without competing, and a sprinkle of salt and paprika ties them to the meal’s flavor profile.
• Coleslaw with vinaigrette — A vinegar-based slaw cuts through the fat with acidity and adds a refreshing crunch that lettuce alone doesn’t provide.
• Sweet potato fries — The natural sweetness contrasts the savory, spicy chicken and adds a pop of color to the plate.
• Dill pickle spears — Extra pickles on the side reinforce that tangy note and cleanse your palate between bites.
• Simple garden salad — A light salad with a lemon vinaigrette keeps the meal from feeling too heavy and adds freshness.
• Iced tea or lemonade — Cold, tart drinks cut through the richness and refresh your mouth after each savory bite.

Make-Ahead Instructions

• Marinate the chicken — You can combine the chicken with the buttermilk and hot sauce up to 24 hours ahead. Keep it covered in the fridge, then bread and fry just before serving.
• Mix the breading — Measure and whisk the flour, cornstarch, and seasonings up to 3 days in advance. Store in an airtight container at room temperature.
• Prep the toppings — Wash and dry the lettuce, slice the tomato, and portion the pickle slices. Store each in separate containers in the fridge so you can assemble quickly.
• Toast the buns — Toast the brioche buns up to 2 hours ahead, let them cool completely, then store in a sealed bag. Re-warm in a 300°F oven for 2 minutes before assembly.

Storage and Reheating

Storage

• Separate components — Store leftover fried chicken in an airtight container without the bun or toppings for up to 3 days in the fridge. Keep buns at room temperature in a sealed bag and store lettuce, tomato, and pickles separately.
• Cool completely first — Let the chicken cool on a wire rack for 15 minutes before refrigerating to avoid condensation that softens the crust.
• Wrap individually — If stacking the chicken pieces, place a sheet of parchment paper between each layer to prevent them from sticking together.

Reheating

• Oven method (best) — Place chicken on a wire rack over a baking sheet in a 375°F / 190°C oven for 10–12 minutes, flipping halfway, until hot and crispy. This restores the crust better than any other method.
• Air fryer — Heat at 375°F for 5 to 7 minutes, flipping once. Watch closely to avoid burning the crust; it re-crisps faster than in an oven.
• Stovetop skillet — Reheat in a dry nonstick skillet over medium heat for 3 to 4 minutes per side. Press gently with a spatula to ensure even contact.
• Avoid the microwave — Microwaving softens the coating into a chewy, soggy mess. Only use it if crispiness doesn’t matter to you.

Nutritional Breakdown (Per Serving)

Based on 1 sandwich per serving (4 servings total).

• Calories: 700
• Protein: 45g
• Fat: 35g
• Carbohydrates: 55g
• Fiber: 2g
• Sugar: 6g
• Sodium: about 800mg

Frequently Asked Questions

Can I freeze Mary Brown’s Big Mary Sandwich before frying?

You can freeze the breaded, uncooked chicken pieces on a baking sheet until solid, then transfer to a freezer bag for up to 1 month. Fry directly from frozen, adding about 2 extra minutes to the cook time.

How long does Mary Brown’s Big Mary Sandwich last in the fridge after cooking?

Store the fried chicken without the bun or toppings in an airtight container for up to 3 days. The texture degrades after that, so it’s best to reheat within that window.

Can I use chicken thighs instead of breasts?

Yes. Boneless skinless thighs work well and are more forgiving if you overcook them slightly. Pound them to ½-inch thickness and adjust the fry time to about 5 to 6 minutes per side.

What oil temperature is best for frying?

350°F / 177°C is ideal. If the oil is too hot, the crust burns before the chicken cooks through. If it’s too low, the breading absorbs excess oil and turns greasy.

Why did my breading fall off during frying?

This usually happens when the chicken wasn’t dried well after the buttermilk soak, or the final breading wasn’t pressed firmly enough. Let the breaded chicken rest on a wire rack for 5 minutes before frying to help the coating set.

Can I make this recipe without buttermilk?

You can substitute by adding 1 tablespoon of lemon juice or white vinegar to 1 cup of regular milk and letting it sit for 5 minutes. It won’t be as thick, but it still provides enough acidity to tenderize.

Final Words

This Mary Brown’s Big Mary Sandwich delivers that satisfying crunch and juicy interior that makes a homemade fried chicken sandwich truly special. The double-dredge technique and buttermilk marinade are simple steps that pay off in every bite. Give it a try next time you’re craving something crispy and rewarding.

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