01 - Preheat oven to 400°F and line a baking sheet with parchment paper.
02 - In a large mixing bowl, mash black beans with a fork or potato masher until mostly smooth with some texture remaining.
03 - Add rolled oats, finely chopped onion, ground cumin, BBQ sauce, and any optional spices. Mix thoroughly until the mixture holds together.
04 - Taste the mixture and adjust with salt and black pepper as needed.
05 - Divide the mixture into 4 equal portions and shape each into a patty.
06 - Place patties on the prepared baking sheet.
07 - Bake for 15 minutes, flipping patties halfway through, until firm and lightly crisped on the outside.
08 - Serve hot on buns with your choice of toppings such as avocado, lettuce, tomato, and vegan mayonnaise.