Make your flax egg: whisk ground flax with water and set aside.
Grind your oats in food processor (or blender) until texture is flour-like. It doesn't have to be perfect, again, some larger pieces of oats are ok in the patty). Set aside in mixing bowl.
Puree beans in food processor (doesn't have to be perfect, as some texture in burger is OK)
Add pumpkin, flax egg, sriracha sauce, green onions, and spices. Pulse just to mix through.
Add wet mixture to dry oatmeal mixture and stir well to combine.
Form 4 patties and pan fry evenly on both sides. Do not overcrowd your skillet. Give yourself room to flip, Don't flip them too soon or they could fall apart,
Enjoy on toasted bun with fixings of your choice.