Preheat a nonstick skillet over medium-high heat. Add 1.5 tablespoons of olive oil.

Add chicken breast strips to the skillet and cook until browned, about 5-7 minutes. Sprinkle fajita seasoning over chicken and stir to combine.

Transfer cooked chicken to a bowl and wipe the skillet clean.

Add remaining olive oil to the skillet. Sauté sliced onion for 3-4 minutes until translucent.

Stir in the sliced bell peppers and cook for another 3-4 minutes until slightly softened.

Return chicken to the skillet and toss with vegetables. Remove from heat.

Wipe the skillet clean. Spray with nonstick cooking spray. Place a tortilla in the skillet.

Spoon some of the chicken and vegetable mixture on half of the tortilla. Sprinkle with cheese.

Fold the tortilla over and cook for 1.5-2 minutes until golden brown. Flip and cook another 1-1.5 minutes.

Repeat with remaining tortillas. Serve warm with optional sides.