In a 10-inch oven-safe skillet, saute garlic, pepper flakes, and salt&pepper in olive oil for about 1 minute. Add crushed tomatoes, water, penne, and an additional 1/4 teaspoon of salt. Bring to a boil, then reduce heat to a simmer. Cover and cook, stirring often, for about 20 minutes, or until pasta is tender. Stir in heavy cream, Parmesan, and basil. Sprinkle mozzarella cheese on top.
Bake for 8-10 minutes in preheated oven, or until cheese is melted and sauce is bubbling.