Preheat oven to 325° Fahrenheit
Spread beans out evenly on a parchment paper lined baking sheet. Bake for 15 minutes, until slightly dried. Remove beans from oven.
If cooking burgers in the oven (instead of the grill or stovetop), raise temperature to 375°F and let preheat.
Blend walnuts in food processor until semi-fine texture.
In large skillet over medium heat, sauté oil, onion, jalapeños, and garlic approximately 5 minutes or until onions and jalapeños are soft. Transfer sautéed ingredients to bowl and use paper towels to blot out excess oil.
Add all recipe ingredients (except black beans) to food processor bowl with walnuts. Blend until just combined. Add beans and blend again. Leave some chunks of beans for texture.
Form ⅓ cups of bean mixture into patties and place on a baking sheet lined with parchment paper. Bake for 10 minutes. Flip over and bake for another 10 minutes. Alternately, cook burgers in an oil-greased skillet for 10 minutes on each side.
Serve on brioche bun with lettuce, onions, tomatoes, spicy mayo, or whatever condiments you like.