In a large bowl, use a potato masher to mash the black beans up. It's ok if a few beans remain whole, but the more smashing the better. (It may be easier to work in batches).
Add in the breadcrumbs, onions, egg, garlic powder and cumin. Add salt and pepper to taste. Using a large spoon, or your hands, thoroughly mix all of these ingredients into the mashed beans. Form the mixture into patties that are about the size of the buns you are using. (These patties do not shrink when cooked).
Burgers can be cooked in 2 different ways
On the Stovetop: Add a little olive oil to a pan and heat over medium-high heat. Place patties in the oil and cook for 5 minutes before flipping. Once the patties have been flipped, immediately add the cheese on top and cook for another 5 minutes. Patties will need to be cooked in batches.
On the Griddle: Spray the griddle with non-stick cooking spray and add the patties. They should all be able to fit in one batch. Cook patties for 5 minutes and then flip. Add cheese on top and cook for another 5 minutes.
Burger Assembly
While the burgers are cooking, open the buns and butter the inside of both the top and bottom. Place buns on a cookie sheet and broil in the oven until toasted and golden.
Place a bean burger on a toasted bun and add lettuce, onion and bread and butter pickles. Add ketchup and mustard to the top of the bun and add it to the burger. Enjoy!
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Notes
*nutrition values are for black bean patty only, bun and toppings need to be added separately