This double layer Ultimate Gluten-Free Healthy Mexican Casserole is oozing with Mexican goodness! This casserole is layered with homemade Paleo tortillas and packed with three melty cheeses, “refried” black beans, grass-fed ground beef, tomatoes, onions, peppers, and SPINACH! Or kale if you prefer! Did I forget to mention that it’s completely sinless and delicious?