Combine the first 8 ingredients in the bowl of a food processor. Pulse a few times until the mixture looks well combined.
Shape the mixture into 8 patties. Refrigerate for 1 hour.
Preheat the oven to 400°F. Spray a baking sheet with cooking spray.
Place patties on the prepared baking sheet. Bake in preheated oven for 15 minutes.
Flip the burgers over. Return the baking sheet to the oven and continue to bake for another 10 minutes, or until browned on both sides.
Serve the burgers on a bun with your favorite burger toppings!
Notes
If you want to use other beans or just can’t find any butter beans, then lima, navy, and kidney beans are all good substitutes! Lentils also fill the role perfectly. Just experiment to see which one fits your taste and texture needs best. (Or which one doesn’t set off the alarms of picky eaters in your family!)