Preheat oven to 400°. In a food processor, process basil, oil, pine nuts, garlic, and ½ teaspoon salt until smooth. Transfer basil mixture to a medium bowl and stir in Parmesan and lemon juice; season with more salt, if needed.
Grease an 11"-by-8" baking dish with cooking spray. Pat chicken dry with paper towels; season all over with pepper and remaining 1 teaspoon salt. Arrange in a single layer in prepared dish. Spread pesto all over chicken, spooning a bit more over top.
Bake chicken 15 minutes. Remove from oven and top with mozzarella. Continue to bake until chicken is cooked through, an instant-read thermometer inserted into thickest part registers 165ºF, and cheese is melted, 5 to 8 minutes. (Optional: If your baking dish is broiler-safe, broil until cheese is browned, 1 to 2 minutes.)
Recipe by 5* trending recipes with videos at https://food.theffeed.com/2023/02/07/pesto-chicken/