Creating Chicken Pizzaiola is straightforward if you follow these simple steps:

1. Prepare the Chicken: Season the chicken breasts with salt and pepper on both sides.
2. Heat the Oil: In a large skillet, heat the olive oil over medium heat.
3. Sear the Chicken: Add the seasoned chicken breasts and sear until golden brown, about 5 minutes per side. Remove the chicken from the skillet and set aside.
4. Sauté the Onion and Garlic: In the same skillet, add chopped onion and sauté until translucent, approximately 3-4 minutes. Add minced garlic and cook for another minute until fragrant.
5. Add Tomatoes: Stir in the canned diced tomatoes and tomato paste until fully combined.
6. Season the Sauce: Add dried oregano and basil. Stir well, and simmer for about 5 minutes.
7. Return Chicken to Skillet: Place the chicken breasts back into the skillet, spooning the sauce over them.
8. Cook the Chicken: Cover the skillet and simmer for about 20 minutes, or until the chicken is cooked through.
9. Add Cheese: Remove the lid and sprinkle shredded mozzarella cheese over the chicken. Cover until the cheese is melted, about 5 minutes.
10. Garnish and Serve: Once the cheese is melted and bubbly, garnish with fresh basil leaves before serving.

By following these steps, you’ll create a flavorful Chicken Pizzaiola that highlights the best of Italian cuisine.