Preheat the oven to 375°F (190°C) and grease a baking dish with olive oil.
Slice the chicken breasts into thin strips and season with fajita seasoning mix.
Sauté the seasoned chicken in a skillet until cooked through.
Slice the bell peppers and onion into thin strips.
Combine cooked chicken with sliced peppers and onions in a bowl.
Spread the mixture in the greased baking dish.
Top with shredded cheese.
Bake for 20-25 minutes until cheese is bubbly and golden brown. to make and sure to become a family favorite.
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