Creating this Easy One Pan Italian Chicken In Tomato Sauce is a breeze when you follow these steps:

1. Prep the Chicken: Pat the chicken breasts dry with paper towels and season with salt and black pepper on both sides.
2. Heat the Oil: In a large skillet or pan over medium-high heat, add olive oil.
3. Brown the Chicken: Once the oil is hot, add the seasoned chicken breasts. Sear for about 5-7 minutes on each side until golden brown. Remove the chicken from the pan and set aside.
4. Sauté Onion and Garlic: In the same pan, add the diced onion. Cook for about 3 minutes until softened, then add minced garlic and cook for another 30 seconds until fragrant.
5. Add Tomatoes and Herbs: Pour in the crushed tomatoes, dried basil, dried oregano, and red pepper flakes if using. Stir to combine and season with more salt and black pepper.
6. Return Chicken to Pan: Place the browned chicken breasts back into the pan. Ensure they are submerged in the sauce as much as possible.
7. Simmer: Bring the sauce to a gentle simmer. Cover the pan and cook for 20-25 minutes until the chicken is cooked through and reaches an internal temperature of 165°F (75°C).
8. Check for Seasoning: Taste the sauce and adjust seasoning if needed.
9. Serve: Once cooked, remove from heat and garnish with fresh basil leaves. Allow to rest for a few minutes before serving.

This step-by-step guide ensures success with every preparation of this incredible one-pan dish!