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Preheat the oven to 375°F (190°C) and grease a baking dish with cooking spray.
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Slice the chicken breasts into thin strips and season with salt, pepper, and half of the fajita seasoning mix.
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Sauté the seasoned chicken in a skillet until cooked through, then set aside.
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In the same skillet, sauté sliced bell peppers, onions, and the remaining fajita seasoning mix until tender-crisp.
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Combine the cooked chicken, sautéed vegetables, sour cream, half of the cheddar and mozzarella cheeses in a bowl.
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Transfer the mixture to the greased baking dish and sprinkle with the remaining cheeses.
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Bake in the preheated oven for 20-25 minutes until the cheese is melted and bubbly.
