Looking for a tasty, protein-filled burger that's budget-friendly and perfect for Meatless Mondays? This healthy take on the classic is less expensive, heart-healthy, and ready to go from items you probably already have in the pantry. For more Southwestern flavor with less carbs, serve each bean burger in lettuce wrap topped with 1 tablespoon salsa and an avocado slice. This also makes a great meatless filling for a taco or burrito. But if you want a more classic taste, serve on a whole grain bun with 1 slice of cheddar cheese, a large lettuce leaf, and a thick slice of tomato.