Chicken Fajita Casserole

Ingredients

• 1.5 pounds chicken breast (about 4 breast)
• 1 tablespoon olive oil
• 2 tablespoons taco seasoning
• 2 cups bell peppers, sliced (mixed colors)
• 1 cup onion, sliced
• 1 1/2 cup shredded cheese (cheddar, pepper-jack, mozzarella or a mix of these)