Prepare the flax egg by mixing ground flaxseed with water and letting it sit until thickened, as this creates a plant-based binder essential for holding the patties together properly.
Mash the black beans in a bowl until mostly smooth with some texture remaining, which helps create a better bite and structure in the final burger.
Combine the mashed beans with quinoa, oats, onion, garlic, seasonings, flax egg, and breadcrumbs, mixing thoroughly until a firm, moldable mixture forms.
Shape the mixture into evenly sized patties, ensuring they are compact so they don’t fall apart during cooking.
Cook the patties in a lightly oiled skillet over medium heat until both sides develop a golden crust and the inside is heated through evenly.
Assemble the burgers in toasted buns with your favorite toppings and serve immediately for the best flavor and texture.
