01 - Preheat oven to 375°F. Grease a 9x13-inch baking dish lightly with butter or cooking spray.
02 - Bring a large pot of salted water to a boil. Cook pasta until al dente, about 2 minutes less than package directions. Drain thoroughly in a colander.
03 - In a large skillet over medium heat, combine heavy cream, pesto, chicken broth, garlic, salt, and black pepper. Bring to a gentle simmer, stirring occasionally, for 2-3 minutes.
04 - Stir in Parmesan cheese until completely melted and sauce is smooth and creamy.
05 - Add cooked pasta, shredded chicken, cherry tomatoes, and spinach to the skillet. Toss everything together until evenly coated with the sauce.
06 - Pour the pasta mixture into the prepared baking dish, spreading evenly.
07 - Sprinkle shredded mozzarella cheese and additional Parmesan evenly over the top.
08 - Bake for 20-25 minutes until cheese is golden brown and bubbling around the edges.
09 - Let the dish rest for 5 minutes before serving to allow the sauce to set slightly. Garnish with fresh basil leaves if desired.