In A Bowl, Combine Beef, Steak Sauce And Seasoned Salt; Mix Well. Shape Into 16 Patties. In A Small Bowl, Combine Cream Cheese, Horseradish And Mustard. Spoon About 1 Tablespoonful Into The Center Of Half Of The Patties; Top With Remaining Patties. Press Edges To Seal. Grill, Uncovered, Over Medium-Hot Heat For 10 Minutes On Each Side Or Until Meat Is No Longer Pink. Serve On Buns.