Step 1

Preheat oven to 400 degrees F (200 degrees C). Spray a 9x13-inch glass baking dish with cooking spray.

Step 2

Spread red bell peppers and onion in the baking dish.

Step 3

Coat chicken strips with a few pinches of the fajita seasoning mix. Heat 2 teaspoons vegetable oil in a skillet over medium heat; cook and stir seasoned chicken until browned, about 2 minutes per side.

Step 4

Place chicken in the baking dish with bell peppers and onion; top with remaining fajita seasoning mix and vegetable oil. Stir until chicken and vegetables are evenly coated.

Step 5

Bake in the preheated oven, stirring halfway through baking, until chicken is no longer pink in the center, about 30 minutes.

Step 6

Spoon chicken mixture into each tortilla and top with sour cream, salsa, and cilantro.