Ingredients

Instructions

  1. Combine ground beef, onion, eggs, bread crumbs, ketchup, salt, and pepper; shape into into twelve thin (about 1/4-inch thick) patties.
  2. Melt the butter in a skillet and sauté the mushrooms until just tender.
  3. Place mushrooms on 6 of the patties. Top with remaining patties and seal edges.
  4. Broil or grill the burgers to desired doneness.
  5. Top each burger with a slice of cheese and let it melt. Serve on split toasted buns. Enjoy!