Cook the pasta as directed on the package. Drain, and mix into the sauce as directed below.
In a large skillet, add the diced tomatoes and frozen chopped spinach and stir together over medium high heat for 4 to 5 minutes, or until spinach has melted.
Stir in the basil, garlic powder and half and half/heavy cream into the tomato sauce. Next, add the shredded rotisserie chicken and half of the grated Parmesan cheese. Stir occasionally and cook over medium high heat for 4 to 5 minutes, to allow ingredients to warm up.
Add the cooked pasta in with the remaining ingredients, and season with salt and pepper to taste.
Serve Tuscan Chicken and Pasta with a side salad, and garnish with remaining grated Parmesan cheese.