Paul Bunyan Burgers

In a skillet, cook bacon until crisp. Remove with a slotted spoon to paper towels. In the drippings, saute mushrooms and onion until tender. Transfer to a bowl with a slotted spoon; add bacon. In another bowl, combine the egg, Worcestershire sauce, seasoned salt, salt, pepper and horseradish; add beef and mix well. Shape into six 1/4-in.-thick patties. Divide bacon mixture among three patties. top with a cheese slice; fold in corners of cheese. Top with remaining patties; seal edges. Grill, uncovered, over medium-hot heat for 10-12 minutes or until meat juices run clear, turning once. Serve on buns.