Preheat your oven to 375ºF and grease a baking sheet with avocado oil.
In a bowl, combine the chicken strips, salsa, and fajita seasoning, ensuring the chicken is evenly coated. Let it marinate for at least 10 minutes.
Spread the peppers, onions, and garlic on one half of the baking sheet. Drizzle avocado oil over them and season with fajita seasoning.
Spread the marinated chicken strips on the other half of the baking sheet.
Bake for 30 minutes, tossing halfway through.
Turn on the broiler and broil the chicken and peppers for 1-2 minutes until browned and crispy.
Serve immediately with tortillas and your favorite toppings.