Slice the chicken breasts, onion and bell peppers.
In a large bowl, stir together the olive oil, smoked paprika, chili powder, cumin, salt, pepper and garlic powder. Add the sliced chicken, peppers, onions and mushrooms to the olive oil mixture, giving everything a good stir.
Spread the seasoned chicken and vegetable mixture onto a greased sheet pan.
Bake at 425 for 30 minutes, stirring halfway through. Serve the Chicken Fajita Tray Bake with tortillas and your favorite toppings.
Notes
Serve these chicken fajitas with your favorite toppings such as Mexican Pickled Onions, Guacamole, Spicy Salsa, chopped onion, sliced jalapenos, chopped cilantro, sour cream or shredded cheese.For extra flavor and to add some visual interest, add a bit of char to the fajitas by broiling them for 5 minutes once they are cooked through.