2 Ingredient Pesto Chicken

skinless and boneless chicken breast fillets ((about 1 kg | 2 pounds))

Basil Pesto (, plus 1/4 cup extra for serving (use this recipe for homemade pesto or you can use store bought))

Salt and Pepper to season ((optional - adjust to your tastes))

| 17 ounces cherry tomatoes ((optional as a serving idea))