Step 1

Preheat the oven to 350 degrees F (175 degrees C). Spray a 9x13-inch baking dish with cooking spray.

Step 2

Spread orzo evenly in the prepared baking dish. Add broth, 2 tablespoons melted butter, garlic, 1/2 teaspoon salt, and pepper; stir to combine. Spread tomatoes evenly over top.

Step 3

Place chicken breasts on a cutting board and trim any visible fat. Drizzle remaining 2 tablespoon melted butter over chicken, then sprinkle with Italian seasoning, remaining 1/4 teaspoon salt, and red pepper flakes. Place chicken over the tomatoes and cover the baking dish with foil.

Step 4

Bake in the preheated oven until chicken is no longer pink in the center and the juices run clear, about 60 minutes. An instant-read thermometer inserted into the center should read at least 165 degrees F (74 degrees C).

Step 5

Remove foil and sprinkle chicken with mozzarella cheese. Bake until cheese is melted, 5 to 7 minutes longer.

Step 6

Drizzle pesto and balsamic glaze over each serving and garnish with basil.