Healthy Sheet Pan Chicken Fajitas

boneless skinless chicken breasts (pounded evenly to about 1/2 inch thickness)

bell peppers, sliced (any color)

large onion, sliced

olive oil (divided)

salt and pepper (to taste)

garlic powder

chili powder

cumin

cayenne pepper

juice of 1 lime

6-inch flour tortillas

toppings: light sour cream, salsa, mashed or sliced avocado, chopped cilantro, lime wedges for squeezing