Add olive to a hot pan over medium heat. Add onions and cook until translucent.
Add garlic. Cook 30 seconds longer.
Add chopped serrano pepper. Cook 1 minute.
In a food processor, add all ingredients and mix until smooth. Refrigerate at least 1 hour so that patties are easier to form.
Form 4 equal sized patties. Place on a baking sheet and bake for 20 minutes at 400°. Flip, then bake another 20-25 minutes or until cooked through*.
*Use a jalapeño for less heat.*Refrigerate the patties for at least an hour so that you can form patties easier.*If you fry or grill the vegan burgers, you'll want to flatten them so that they cook evenly. When flattening them they will be wider, so you might want to make them smaller so that they'll fit into a bun.*Freeze baked burgers and bake or microwave them straight from the freezer. For baking, they only need about 20 minutes at 400°.*Nutritional info does not include nacho cheese sauce. See that recipe for info.