- Preheat the oven to 400F. Line a large baking sheet with parchment or foil. If using foil, spray the foil with cooking spray.
- Stir oil with chili powder, oregano, salt and garlic powder. Place chicken breasts in a row on prepared sheet. Smear about half of spice mixture over each one.
- Combine peppers and onion with remaining spice mixture in a large bowl. Mix well to coat everything then place in an even layer on prepared sheet.
- Bake 30 to 35 minutes or until chicken is springy when pressed and cooked through. Sprinkle chicken with cheese and bake another 2 to 4 min or until melted.
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