Preheat the oven to 375°F.
In a large skillet over medium heat, melt butter. Sauté minced garlic for 1 minute. Stir in flour to create a roux.
Add heavy cream, whole milk, and Italian seasonings. Simmer for 3-4 minutes until the sauce thickens. Stir in grated Parmesan cheese until melted. Remove from heat and mix in minced baby spinach.
Place ravioli in an oven-safe dish. Pour the creamy spinach sauce over them, ensuring full coverage. Sprinkle with mozzarella cheese and optional red chili flakes. Bake for 18-20 minutes until the cheese is melted and bubbly.
Take the dish out of the oven and garnish with fresh basil leaves. Your creamy spinach and cheese ravioli bake is ready to be enjoyed.