Heat the oven. Set the oven to 425°F. Position a rack in the upper third of the oven so the chicken is close enough to brown under the broiler (about 4 to 6 inches from the heat source in many ovens).
Slice the chicken thin. Pat the chicken thighs dry. Slice into thin strips, about 1/4-inch thick. Thinner slices mean more browned bits, and that’s the whole point.

Mix the marinade. In a large bowl, whisk together the yogurt, olive oil, lemon juice, garlic, salt, paprika, cumin, oregano, coriander, black pepper, and cayenne (if using).
Marinate (quickly or longer). Add chicken and toss until fully coated. If you have time, cover and refrigerate for 30 minutes to 8 hours. If not, you can cook it right away. It still works.
Make-ahead note: You can mix the marinade up to 2 days ahead and keep it covered in the fridge.
Roast (do not crowd the pan). Spread the chicken in an even layer on a rimmed sheet pan. Leave a little space between pieces so they roast instead of steam. If your pan looks crowded, use two sheet pans.
Roast for 14 to 16 minutes, then use tongs to toss the chicken and re-spread it into an even layer. Continue roasting until cooked through and starting to brown at the edges.
Doneness tip: Chicken is safely cooked when it reaches 165°F at the thickest part. If you do not have a thermometer, look for opaque meat with no pink and juices running clear.

Broil for crisp edges. Switch to broil on high and broil for 1 to 2 minutes, watching closely. Broilers go from “perfect” to “oops” fast. Pull it when you see crispy, darkened spots on top.
If your oven manual recommends broiling with the door cracked, follow that guidance. Otherwise keep the door closed and stay nearby.
Make the yogurt garlic sauce. While the chicken cooks, stir together yogurt, mayo (if using), lemon juice, garlic, salt, and herbs. Taste and adjust. If it’s too thick, loosen with 1 to 2 teaspoons water.
Make-ahead note: The sauce can be made 1 to 2 days ahead. Store covered in the fridge and stir before serving.

Warm the pita. Warm pita in a dry skillet for 30 seconds per side, or wrap in foil and warm in the oven for the last few minutes.
Build your doner kebabs. Spread sauce on warm pita, pile on chicken, then add lettuce, tomatoes, onion, cucumber, and pickles. Finish with extra sauce and hot sauce if you want it louder.

Eat immediately. Doner waits for no one. If you want to be fancy, serve everything family-style and let everyone build their own.
