Creating Cheesy Baked Chicken Breast and Peppers can be simple if you follow these easy steps:

1. Preheat Oven: Preheat your oven to 375°F (190°C).
2. Prepare Chicken: Pat the chicken breasts dry with paper towels. Season both sides with salt, pepper, garlic powder, and Italian seasoning.
3. Sauté Vegetables: In a large oven-safe skillet, heat the olive oil over medium heat. Add the sliced onions and bell peppers, sautéing until they are tender (about 5-7 minutes).
4. Add Chicken: Push the vegetables to the sides of the skillet and place the seasoned chicken breasts in the center.
5. Add Sauce: Pour the marinara sauce evenly over the chicken breasts.
6. Top with Cheese: Sprinkle the shredded mozzarella cheese generously over the chicken and vegetables.
7. Bake: Transfer the skillet to the preheated oven and bake for 30-35 minutes, or until the chicken is cooked through (internal temperature of 165°F or 75°C).
8. Rest: Remove the skillet from the oven and let it rest for 5-10 minutes before serving. This allows the juices to redistribute.
9. Serve: Garnish with fresh herbs like basil or parsley, if desired.

These steps will guide you in creating this incredible dish effortlessly.