Preheat oven to 350 degrees F.

In a medium skillet or saucepan, melt butter over medium heat. I am in love with my Anolon Cookware because they heat evenly and are super durable.

Add garlic and cook for 1 to 2 minutes stirring constantly to prevent burning. Add flour and stir to combine. Cook 1 minute. Add cream cheese and cook for 2 minutes.

Add 1 cup milk and stir to combine. Once thickened and bubbling, add the remaining milk. Cook for 5 to 7 minutes, stirring often, until cream cheese has melted and sauce thickens.

Add Parmesan cheese. Stir to combine. Remove from heat.

Pour about 1/4 of the sauce into the bottom of a 9-inch x 13-inch baking dish. Spread the sauce over bottom of the dish.

Add frozen ravioli to the baking dish and spread into an even layer. Top pasta with chopped spinach and chicken so the ravioli is covered.

Pour the rest of the sauce over the chicken and spread evenly around the baking dish. Sprinkle all over the top the casserole with mozzarella cheese.

Bake for 30 minutes, or until the sauce is bubbly and the ravioli is cooked. Turn your oven to broil on HIGH and cook for 2-3 minutes, or until the top of the casserole is golden.

Carefully remove from the oven. Sprinkle basil over the casserole. Let sit 5 to 10 minutes. Serve warm with extra Parmesan if desired.