1. Preheat your oven to 400°F (200°C). Line a baking dish with parchment paper or lightly grease it with olive oil.
2. Season the chicken breasts generously with salt and freshly ground black pepper on both sides.
3. Heat 1 tablespoon of olive oil in a large skillet over medium-high heat. When the oil shimmers, add the chicken breasts. Sear for 3-4 minutes on each side until golden brown but not fully cooked through.
4. Remove the chicken from the skillet and place it in the prepared baking dish.
5. Spread about 2 tablespoons of basil pesto evenly over each chicken breast.
6. In a medium bowl, combine the halved cherry tomatoes, diced red onion, minced garlic, and a pinch of salt. Toss gently to mix the flavors.
7. Spoon the tomato mixture over the pesto-layered chicken breasts, distributing it evenly.
8. Top each chicken breast with fresh mozzarella pieces.
9. Bake the chicken in the preheated oven for 15-20 minutes, or until the chicken is cooked through (internal temperature should reach 165°F/74°C) and the cheese is melted and bubbly.
10. Remove from the oven and sprinkle chopped fresh basil over the top. If you like, drizzle a little balsamic glaze for a touch of sweetness and acidity.
11. Let the chicken rest for 5 minutes before serving to allow the juices to redistribute. This step always reminds me of Mama Lou’s gentle patience in the kitchen—good things come to those who wait.

From my experience, searing the chicken first locks in the juices and adds a beautiful crust that contrasts with the softness of the toppings. Ouma once told me, “The secret is all in the sear,” and she was absolutely right. Don’t rush this part!