In a mixing bowl, mash the black beans until mostly smooth. Add cooked quinoa, onion, garlic, carrots, cumin, paprika, salt, and pepper. Mix well.

Stir in breadcrumbs until the mixture holds together. If too wet, add more breadcrumbs.

Shape the mixture into 4 equal patties.

Heat a skillet over medium heat and add a little oil. Cook the patties for about 5-7 minutes on each side until golden brown.

If using cheese, place a slice on each patty during the last minute of cooking to melt.

Place each patty on a bun and top with lettuce, tomato, and pickles. Serve immediately.