This black bean burger recipe is a great vegetarian option that is packed with flavor and protein. Using a food processor to chop the black beans ensures that they are finely chopped and results in a meaty texture. Mix in some breadcrumbs, egg, and spices to the black beans and form into patties. Grill or pan-fry the patties until crispy and serve on a toasted bun with avocado, salsa, and sour cream.