Step 1: Prepare the Chicken

1. Pat the chicken breasts dry with a paper towel.

2. Using a sharp knife, carefully cut a pocket into the side of each chicken breast, being careful not to cut all the way through.

3. In a small bowl, mix salt, black pepper, garlic powder, and oregano. Rub this seasoning mixture all over the chicken breasts.

Step 2: Stuff the Chicken

1. In another bowl, combine shredded mozzarella, grated Parmesan, fresh basil, and red pepper flakes (if using).

2. Stuff each chicken breast with an equal portion of the cheese mixture, pressing gently to close the pocket. You can use toothpicks to secure them if needed.

Step 3: Sear the Chicken

1. Heat 1 tablespoon olive oil in a large oven-safe skillet over medium-high heat.

2. Sear the stuffed chicken breasts for 3-4 minutes per side until golden brown.

3. Remove from heat and set aside while making the Pomodoro sauce.

Step 4: Prepare the Pomodoro Sauce

1. In the same skillet, heat 2 tablespoons olive oil over medium heat.

2. Add minced garlic and chopped onions, sautéing until soft and fragrant (about 3 minutes).

3. Stir in diced tomatoes, oregano, salt, black pepper, and red pepper flakes. Let it simmer for 10 minutes, stirring occasionally.

4. Pour in chicken broth and simmer for another 5 minutes, allowing the flavors to meld.

5. Stir in fresh basil, then nestle the seared stuffed chicken back into the skillet.

Step 5: Bake to Perfection

1. Preheat oven to 375°F (190°C).

2. Place the skillet in the oven and bake for 12-15 minutes, or until the chicken is cooked through (internal temp of 165°F/75°C).

3. Remove from oven and let it rest for 5 minutes before serving.

Step 6: Serve & Enjoy

1. Spoon extra Pomodoro sauce over each chicken breast.

2. Garnish with fresh basil and a sprinkle of Parmesan cheese.

3. Serve with your favorite pasta, roasted vegetables, or a side salad.