Place pork tenderloin patty (one for each person) at bottom of baking dish. Season with seasoning salt. Place one THICK slice of onion on each patty. Place one THICK slice tomato on top of onion. Cut slice of bacon in half and place criss cross on top of each patty. Secure with toothpick. Cover tightly with foil. Bake 1 1/2 to 2 hours. The last 15 minutes uncover and place a square of cheddar cheese on top of each patty. 350 degree oven.