If you're craving a veggie sandwich with a kick, try a spicy black bean burger. Mash some black beans with breadcrumbs, chopped onions, garlic, and your favorite spices like cumin, paprika, and chili powder. Form the mixture into patties and cook them on a grill or stovetop until crispy. Serve the black bean patty on a whole grain bun with lettuce, tomato, avocado, and a spicy chipotle mayo. This sandwich is packed with protein and flavor.