Add black beans to a mixing bowl and mash half of them for texture. Then add sweet potato and spices. Mix to combine.
Taste and adjust seasonings as needed. Add more bread crumbs to the mixture of it feels too wet. It should be very moist but moldable.
Place molded burgers on a lightly grease a baking sheet.
Bake burgers for a total 30-45 minutes, carefully flipping 20 minutes in to ensure even cooking. The longer you bake them the firmer and drier they will get.