Creating Easy One Pan Italian Chicken In Tomato Sauce is straightforward if you follow these well-defined steps:

1. Heat the Oil: In a large skillet, heat the olive oil over medium-high heat.
2. Brown the Chicken: Add the chicken breasts to the skillet and season with salt and pepper. Sear each side until golden brown, about 4-5 minutes per side.
3. Remove Chicken: Once browned, remove the chicken from the skillet and set aside.
4. Cook Onions and Garlic: In the same pan, add the chopped onions. Sauté for about 3 minutes until they become translucent. Add minced garlic and sauté for another minute.
5. Add Tomatoes and Spices: Pour in the crushed tomatoes, dried oregano, dried basil, and red pepper flakes (if using). Stir well to combine.
6. Return Chicken: Place the chicken breasts back into the skillet. Spoon some of the sauce over the top of the chicken.
7. Simmer: Cover the skillet and let it simmer over low heat for about 20 minutes, or until the chicken is cooked through and reaches an internal temperature of 165°F (75°C).
8. Garnish: Remove the skillet from heat, then garnish with freshly chopped parsley and serve with grated Parmesan cheese, if desired.

These clear-cut steps will guide you through the process of making this incredible dish with ease!