Crispy Onion Chicken Sandwich

Featured in: Lunch Hit

This showstopping sandwich features tender buttermilk-marinated fried chicken thighs with a golden, crispy exterior. Layer it with homemade crispy fried onions and smooth garlic aioli, then serve on a soft brioche bun. The combination of textures—juicy chicken, crunchy onions, and creamy spread—creates an irresistible bite every time.

Updated on Sun, 18 Jan 2026 14:44:00 GMT
Golden crispy chicken thigh on a toasted brioche bun, topped with crunchy fried onions and creamy aioli. Save
Golden crispy chicken thigh on a toasted brioche bun, topped with crunchy fried onions and creamy aioli. | ticktaste.com

My neighbor knocked on my door one Saturday holding a greasy paper bag and grinning like she'd won something. Inside was the most glorious fried chicken sandwich I'd ever seen, piled so high with crispy onions it barely fit in the wrapping. She wouldn't tell me where she got it, just said I had to figure it out myself. That became my weekend project, and after a few lopsided attempts and one smoke alarm incident, I landed on this version that might even be better than hers.

I made these for a birthday dinner once, and my friend who claims she doesn't like fried food ate two. She kept picking off the onions between bites, then finally gave up and just committed to the whole messy experience. We ended up with aioli on our sleeves and crumbs everywhere, but nobody cared. It's that kind of sandwich.

Ingredients

  • Boneless, skinless chicken thighs: Thighs stay juicy even if you overcook them slightly, unlike breasts which can turn dry and sad.
  • Buttermilk: The acidity tenderizes the meat and adds a subtle tang that balances the richness of frying.
  • Garlic powder and paprika: These season the chicken from the inside out, so every bite has flavor even before the breading.
  • All-purpose flour: The base for both breading and onion coating, giving structure and crispness.
  • Cornstarch: This is the secret to that extra-shatter crunch on the chicken; don't skip it.
  • Smoked paprika: Adds a deeper, almost campfire-like warmth to the breading.
  • Yellow onion: Sliced thin, these fry up sweet and crispy, adding texture and a slight caramel note.
  • Mayonnaise: The creamy base for aioli that clings to every surface without sliding off.
  • Garlic clove: Fresh garlic in the aioli makes it taste alive, not like it came from a jar.
  • Lemon juice: Brightens the aioli and cuts through the fried richness.
  • Dijon mustard: Just a little adds complexity and a hint of sharpness.
  • Brioche buns: Soft, slightly sweet, and sturdy enough to hold everything without falling apart in your hands.

Instructions

Marinate the chicken:
Whisk buttermilk with garlic powder, paprika, salt, and pepper until smooth, then submerge the chicken thighs completely. Cover and chill for at least 30 minutes, though a few hours makes them even more tender.
Prepare the breading:
Combine flour, cornstarch, smoked paprika, salt, and pepper in a shallow dish, mixing well so the seasonings distribute evenly.
Coat the onions:
Toss thinly sliced onions with flour, salt, and pepper until every piece is lightly dusted. Shake off any excess before frying.
Fry the onions:
Heat about an inch of oil to 350°F in a large skillet, then fry onions in small batches until golden and crisp, about 2 to 3 minutes. Drain on paper towels and resist the urge to snack on them all.
Bread the chicken:
Lift each thigh from the marinade, let the excess drip off, then press firmly into the breading mixture on all sides. The buttermilk helps the coating stick like glue.
Fry the chicken:
Slide breaded thighs into the hot oil and fry for 5 to 7 minutes per side until deep golden and cooked through. Transfer to a wire rack so they stay crispy, not soggy.
Make the aioli:
Stir together mayonnaise, minced garlic, lemon juice, Dijon, salt, and pepper until smooth and creamy.
Toast the buns:
Butter the cut sides of the brioche buns and toast them in a skillet until golden and fragrant, which only takes a minute or two.
Assemble the sandwiches:
Spread aioli generously on both bun halves, layer with lettuce if using, add the fried chicken, pile on crispy onions, and close it up. Press down gently so everything melds together.
A juicy buttermilk-marinated chicken sandwich stacked with crispy onions and lettuce on a buttery brioche bun. Save
A juicy buttermilk-marinated chicken sandwich stacked with crispy onions and lettuce on a buttery brioche bun. | ticktaste.com

The first time I nailed this recipe, I sat at my kitchen counter alone with one of these sandwiches and just felt proud. It wasn't fancy or complicated, but it was exactly what I wanted it to be. Sometimes that's all you need from cooking.

Make It Your Own

If you like heat, whisk hot sauce into the aioli or dust cayenne pepper into the breading for a spicy kick. Swap chicken thighs for breasts if that's what you have, just watch the timing since they cook faster. Some people love adding pickles or a tangy coleslaw on top for extra crunch and acidity, and I won't argue with that.

Storing and Reheating

Fried chicken keeps in the fridge for up to two days, and you can reheat it in a 375°F oven for about 10 minutes to bring back some crispness. The onions lose their crunch once they sit, so fry those fresh if you can. Aioli stays good in the fridge for almost a week, which means you can make it ahead and have one less thing to worry about.

Serving Suggestions

These sandwiches are filling enough to stand alone, but they pair beautifully with sweet potato fries, a simple green salad, or even just some good potato chips. Cold beer or iced tea feels right alongside them, especially if you're eating outside. If you're feeding a crowd, set up a toppings bar with extra aioli, pickles, hot sauce, and let everyone build their own.

  • Try serving with a side of tangy vinegar-based slaw to cut through the richness.
  • Offer extra napkins, because this sandwich does not stay tidy.
  • Warm the plates slightly so the chicken stays hot longer.
Homemade Crispy Onion Chicken Sandwich with golden fried onions, creamy aioli, and tender chicken on a soft bun. Save
Homemade Crispy Onion Chicken Sandwich with golden fried onions, creamy aioli, and tender chicken on a soft bun. | ticktaste.com

This sandwich has become my go-to when I want to impress without pretending to be fancy. It's honest, satisfying, and always makes people happy.

Recipe Questions

How long should I marinate the chicken?

Marinate for at least 30 minutes, but up to 4 hours for deeper flavor. The buttermilk tenderizes the meat while infusing it with subtle tang and spice.

Can I use chicken breasts instead of thighs?

Yes, boneless, skinless chicken breasts work well. Reduce cooking time to 4–6 minutes per side to prevent drying out. Pound breasts to even thickness for uniform cooking.

What oil temperature is best for frying?

Maintain 350°F (175°C) for perfectly crispy coatings without greasy results. Use a thermometer to monitor temperature throughout frying both onions and chicken.

How do I make the crispy onions extra crunchy?

Slice onions thin and consistent, fry in batches to avoid overcrowding, and drain on paper towels immediately. Store in an airtight container until assembly.

Can I prepare components ahead of time?

Marinate chicken up to 4 hours ahead. Make aioli 1 day in advance. Fry onions and chicken just before serving for maximum crispiness.

What side dishes pair well with this sandwich?

Serve with pickles, coleslaw, french fries, or potato chips. The tangy or crispy sides complement the rich, savory sandwich perfectly.

Crispy Onion Chicken Sandwich

Buttermilk-marinated fried chicken topped with crunchy fried onions and garlic aioli on toasted brioche.

Setup time
25 min
Heat time
25 min
Complete duration
50 min
Created By Jamie Torres

Classification Lunch Hit

Complexity Medium

Cultural Background American

Output 4 Portions

Dietary considerations None specified

Components

Chicken & Marinade

01 4 boneless, skinless chicken thighs
02 1 cup buttermilk
03 1 teaspoon garlic powder
04 1 teaspoon paprika
05 1/2 teaspoon salt
06 1/2 teaspoon black pepper

Breading

01 1 cup all-purpose flour
02 1/2 cup cornstarch
03 1 teaspoon smoked paprika
04 1 teaspoon salt
05 1/2 teaspoon ground black pepper

Crispy Onions

01 1 large yellow onion, thinly sliced
02 1/2 cup all-purpose flour
03 1/2 teaspoon salt
04 1/2 teaspoon black pepper
05 Vegetable oil for frying

Aioli

01 1/2 cup mayonnaise
02 1 large garlic clove, minced
03 1 tablespoon lemon juice
04 1/2 teaspoon Dijon mustard
05 Salt and pepper to taste

Assembly

01 4 brioche buns, sliced
02 Butter for toasting buns, optional
03 Lettuce leaves, optional

Directions

Phase 01

Prepare Marinade and Marinate Chicken: In a bowl, whisk together buttermilk, garlic powder, paprika, salt, and black pepper. Add chicken thighs, ensuring they are fully coated. Cover and refrigerate for at least 30 minutes, or up to 4 hours.

Phase 02

Mix Breading Ingredients: In a shallow dish, mix flour, cornstarch, smoked paprika, salt, and black pepper for the breading mixture.

Phase 03

Coat Onion Slices: In a separate bowl, toss sliced onions with flour, salt, and black pepper until well coated.

Phase 04

Fry Onions Until Crispy: Heat 1 inch of vegetable oil in a large skillet to 350°F. Fry onions in batches until golden and crisp, about 2-3 minutes per batch. Drain on paper towels.

Phase 05

Bread and Fry Chicken: Remove chicken from marinade, allowing excess buttermilk to drip off. Dredge each thigh in the breading mixture, pressing to adhere. Fry chicken in the same hot oil for 5-7 minutes per side until cooked through and golden brown. Transfer to a wire rack or paper towels to drain.

Phase 06

Prepare Garlic Aioli: In a small bowl, combine mayonnaise, garlic, lemon juice, Dijon mustard, salt, and pepper to make the aioli.

Phase 07

Toast Brioche Buns: Butter and toast brioche buns in a skillet until golden, if desired.

Phase 08

Assemble Sandwiches: Spread aioli on both sides of each bun. Layer with lettuce if using, fried chicken, a generous mound of crispy onions, and top with the bun.

Tools needed

  • Mixing bowls
  • Large skillet or deep fryer
  • Tongs
  • Wire rack or paper towels
  • Knife and cutting board

Allergy details

Review each component for potential allergens and seek professional healthcare guidance if you're uncertain.
  • Contains eggs in mayonnaise
  • Contains wheat in flour and brioche buns
  • Contains milk in buttermilk and butter
  • Contains mustard in aioli
  • Buns may contain soy or other allergens

Nutrient breakdown (per portion)

These values are approximate guidelines only and shouldn't replace professional medical consultation.
  • Energy Value: 670
  • Fats: 32 g
  • Carbohydrates: 61 g
  • Proteins: 32 g