Crispy Buttermilk Chicken Sandwich with Spicy Mayo

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A crispy buttermilk chicken sandwich starts with chicken thighs soaked in buttermilk for at least 4 hours, then double-dredged in a seasoned flour mix and fried at 175 C / 350 F until the crust turns deep gold and the meat hits 165 F / 74 C inside. The buttermilk tenderizes the meat and the acid helps the crust cling instead of sliding off in the oil.

I use boneless, skinless thighs here because they stay juicier than breast meat and forgive an extra minute in the fryer if your oil temp dips.

The crunch comes from a cornstarch-flour blend and that double dip through the buttermilk, which builds the craggy ridges you want on a fried chicken sandwich instead of a smooth, thin shell.

Toasted brioche, a smear of spicy mayo, and a few pickle chips round it out. No fancy tools needed, just a deep pot, an instant-read thermometer, and patience while the chicken brines.

Why You’ll Love This Recipe

• Craggy, crunchy crust that holds up under sauce
• Buttermilk brine keeps the chicken juicy inside
• Spicy mayo comes together in under 5 minutes
• Fries in one pot, no special equipment needed

Ingredient Notes

• chicken thighs: Boneless, skinless thighs stay juicier than breast during frying. Breast works too, but watch it closely since it dries out faster.
• buttermilk: The acid tenderizes the meat and thins enough to build a thick dredge. No buttermilk? Stir 1 tbsp lemon juice into 2 cups regular milk and let it sit 5 minutes.
• cornstarch: Mixed into the flour, it makes the crust lighter and crisper than flour alone. Rice flour is a solid swap if you’re out.
• hot sauce: A classic cayenne-style sauce like Frank’s or Crystal works well in both the brine and the mayo. Adjust up or down for heat tolerance.
• brioche buns: The slight sweetness balances the spicy mayo and salty crust. Potato buns are a good gluten-heavy alternative with similar softness.
• dill pickle chips: Bread-and-butter pickles work if you want sweetness instead of straight tang. Skip them if you’re not into pickles, the sandwich still holds together.

Crispy Buttermilk Chicken Sandwich with Spicy Mayo

Buttermilk-brined chicken thighs get a double flour dredge and a hot oil fry, then land on toasted brioche with spicy mayo and pickles.

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Prep Time 15 minutes mins

Cook Time 20 minutes mins

Total Time 4 hours hrs 35 minutes mins

Servings: 4 servings

Course: Sandwich

Cuisine: American

Calories: 640

Ingredients Method Notes

Ingredients

  

Chicken and Brine

• 4 pieces boneless, skinless chicken thighs (about 680 g)
• 2 cups buttermilk (480 ml)
• 2 tbsp hot sauce cayenne-style, like Frank's or Crystal
• 1 tsp kosher salt
• 1/2 tsp black pepper

Dredge and Fry

• 1 1/2 cups all-purpose flour (190 g)
• 1/2 cup cornstarch (60 g)
• 1 tbsp paprika
• 1 tsp garlic powder
• 1 tsp onion powder
• 1/2 tsp cayenne pepper
• 1 tsp kosher salt
• 1/2 tsp black pepper
• neutral oil for frying about 1 liter (4 cups); peanut or vegetable oil

Spicy Mayo

• 1/2 cup mayonnaise (120 g)
• 1 tbsp hot sauce
• 1 tsp honey
• 1 tsp lemon juice

Assembly

• 4 brioche buns , split
• 16 dill pickle chips to 20
• 4 butter lettuce leaves optional

Method

 

Brine the Chicken

1. Whisk buttermilk, hot sauce, 1 tsp salt, and 1/2 tsp pepper in a bowl or zip-top bag.
2. Add chicken thighs, submerge fully, cover, and refrigerate at least 4 hours or up to overnight.

Make the Spicy Mayo

1. Stir mayonnaise, hot sauce, honey, and lemon juice in a small bowl until smooth. Cover and refrigerate until ready to use.

Dredge and Fry

1. Whisk flour, cornstarch, paprika, garlic powder, onion powder, cayenne, 1 tsp salt, and 1/2 tsp pepper in a shallow dish.
2. Pour oil into a deep pot to 5 cm / 2 inches depth and heat to 175 C / 350 F, checking with an instant-read thermometer.
3. Lift a chicken thigh from the buttermilk, letting excess drip off, then press into the flour mix to coat well. Dip back into the buttermilk, then dredge again in flour for a craggy double coat. Repeat with remaining thighs.
4. Fry chicken in batches of 2, about 6 to 7 minutes per side, until the crust is deep golden and internal temperature reaches 165 F / 74 C. Transfer to a wire rack over a sheet pan to drain.

Assemble

1. Toast brioche buns cut-side down in a dry skillet, 1 to 2 minutes, until golden.
2. Spread spicy mayo on both cut sides of each bun. Layer the bottom bun with lettuce, a fried chicken thigh, and pickle chips. Close and serve hot.

Notes

• Brine chicken thighs at least 4 hours for the buttermilk to fully tenderize the meat.
• Don't crowd the pot when frying; 2 pieces at a time keeps oil temp steady.
• Rest fried chicken on a wire rack so steam doesn't soften the crust underneath.
• Check internal temp with a thermometer; pull at 165 F / 74 C exactly.

Tips for Success

• Brine the chicken at least 4 hours; overnight builds even more tenderness and flavor.
• Press the flour into the chicken firmly on the first dredge so it grabs the second coat.
• Check oil temp with a thermometer before each batch; it drops fast after the first fry.
• Rest fried chicken on a wire rack, not paper towels, so steam doesn’t soften the crust.
• Toast the buns in the same skillet right after frying to use the last bit of chicken fat.

Variations

• Swap cayenne for smoked paprika and skip the hot sauce for a milder, kid-friendly version.
• Add a slice of pepper jack under the chicken while it’s still hot so it melts slightly.
• Use a spicy dill slaw instead of lettuce for crunch and extra tang in every bite.

Storage and Reheating

Store fried chicken thighs in an airtight container in the fridge for up to 3 days. Keep the spicy mayo separate in its own jar so the crust doesn’t turn soggy from sitting in sauce.

Reheat chicken in a 190 C / 375 F oven or air fryer for 8 to 10 minutes until the crust re-crisps and the center is hot. Skip the microwave, it turns the crust rubbery.

Assembled sandwiches don’t hold well beyond an hour, since the bun softens fast. Build fresh right before serving if you’re feeding a crowd.

Serving Suggestions

Crispy buttermilk chicken sandwiches pair well with something acidic on the side to cut the fried richness. A quick vinegar-based coleslaw or a pile of dill pickle spears both work.

For a full plate, add crinkle-cut fries or a simple potato wedge with extra spicy mayo for dipping. A cold, crisp lager or lemonade balances the heat if you’ve gone heavy on the hot sauce.

Halve the sandwiches for a game-day spread alongside wings or loaded nachos.

FAQ

Why is the crust on my buttermilk chicken sandwich soggy instead of crispy?

Soggy crust usually means the oil temp dropped too low, so the coating absorbs oil instead of frying fast. Check with a thermometer and keep it steady at 175 C / 350 F, frying only 2 pieces at a time so the oil recovers between batches.

Can I use chicken breast instead of thighs for this buttermilk chicken sandwich?

Yes, chicken breast works, but it cooks faster and dries out more easily than thighs. Pound it to an even 2 cm thickness and pull it as soon as it hits 165 F / 74 C to keep it juicy under that crispy crust.

Can I brine the chicken overnight before frying?

Yes, an overnight buttermilk brine is fine and actually builds more tenderness than the minimum 4 hours. Don’t go past 24 hours though, since the acid can start breaking down the texture and make the meat mushy.

What sides go well with a crispy buttermilk chicken sandwich?

Vinegar-based coleslaw, crinkle-cut fries, or a simple pickle spear all balance the fried richness well. Something acidic on the side keeps the meal from feeling heavy, since the sandwich itself is already rich with mayo and crust.

Is this crispy buttermilk chicken sandwich gluten free?

No, this version isn’t gluten free because of the all-purpose flour dredge and brioche bun. Swap in a 1:1 gluten-free flour blend for the dredge and a gluten-free bun to make it work, though the crust texture will be slightly different.

What’s the difference between this and a Nashville hot chicken sandwich?

Nashville hot chicken gets a cayenne-lard paste brushed on right after frying, making it much spicier and darker in color. This sandwich keeps the heat inside the dredge and the mayo instead, so it’s crispy and tangy rather than fiery.

If you enjoyed this, try

• Korean Fried Chicken with Gochujang Glaze recipe
• the Crispy Chicken Katsu with Tonkatsu Sauce