Step 2
Heat 1 tsp. oil in large nonstick skillet on medium heat. Add patties; cook 2 to 3 min. on each side or until browned on both sides. Remove from skillet; cover to keep warm. Add remaining oil, onions and mushrooms to skillet; cook 3 to 5 min. or until onions are soft and translucent and mushrooms are golden brown, stirring frequently.