Step 1: Prep the Chicken
Pat the chicken breasts completely dry with paper towels – this is crucial for good browning. If the breasts are very thick (over 1 inch), butterfly them or use a meat mallet to pound to even thickness (about 3/4 inch). This ensures even cooking. Season both sides generously with salt, pepper, and Italian seasoning.

Step 2: Preheat Oven
Preheat your oven to 400°F (200°C). You’ll finish cooking the chicken in the oven after searing, which keeps it juicy and allows the cheese to melt perfectly.

Step 3: Sear the Chicken
Heat olive oil in a large oven-safe skillet over medium-high heat. Once the oil is shimmering and hot (but not smoking), carefully add the seasoned chicken breasts. Don’t move them! Let them sear undisturbed for 5-6 minutes until golden brown on the bottom. Flip with tongs and sear the other side for 4-5 minutes until golden. The chicken doesn’t need to be fully cooked yet – it will finish in the oven.

Step 4: Add Garlic and Tomatoes
Reduce heat to medium. Push the chicken to the sides of the pan and add minced garlic to the center. Sauté for 30-60 seconds until fragrant. If using cherry tomatoes, add them now and sauté for 2-3 minutes until they start to soften and release juices. This creates a flavorful base.

Step 5: Add Pesto
Spoon the basil pesto generously over each chicken breast, spreading it evenly to cover the top of each piece. Use about 2-3 tablespoons per breast. The pesto will melt and become sauce-like in the oven, so don’t worry if it seems thick now.

Step 6: Top with Cheese
Place mozzarella cheese slices over the pesto on each chicken breast, or sprinkle shredded mozzarella evenly. Use enough cheese to cover the pesto – we want gooey, melted perfection!

Step 7: Bake
Transfer the entire skillet to the preheated oven. Bake for 8-12 minutes, until the chicken reaches an internal temperature of 165°F when checked with a meat thermometer and the cheese is melted, bubbly, and starting to brown in spots. Cooking time depends on chicken thickness.

Step 8: Optional Broil
For extra golden, bubbly cheese, turn on the broiler for the last 1-2 minutes. Watch carefully to prevent burning! The cheese should be golden brown with some darker spots.

Step 9: Rest and Serve
Remove from oven and let the chicken rest for 3-5 minutes before serving. This allows juices to redistribute. Garnish with fresh basil leaves, grated Parmesan, and red pepper flakes if desired. Spoon any pan juices, tomatoes, and melted cheese over the chicken when plating.