Mash the beans in a large bowl with a potato masher or back of a spoon. Add mustard, soy sauce, ketchup/tomato paste, and the sauteed vegetables. Mix in the oats. Add salt and pepper to taste.
Moisten your hands and form the burger mixture into six 3 - 4 inch / 8 - 10 cm patties. Lightly spray a nonstick skillet and cook the burgers on medium-low for 5-8 minutes per side. Or bake on sprayed baking tray at 350F/180C for 25 minutes.
posted by Carey