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