Messy Joe Grilled Cheese Casserole is a simple ground hamburger supper formula your entire family will love. This delicious meal is stacked with mozzarella cheddar and messy joe filling sandwiched between two layers of bread. To make this messy joe dish, I begun by cooking some ground meat in an extensive griddle alongside some diced onions. Also try our recipe Sausage Stuffed portobello Mushrooms #dinnerrecipe #amazingrecipe Ingredients 1lb lean ground beef 1 yellow onion, diced 1 cup ketchup 1 tbsp Worcestershire sauce 1/4 cup brown sugar 2 tsp onion powder 12 slices bread 1/2 cup margarine 4 cups mozzarella cheese, shredded Instructions Preheat oven to 400F. Cook ground beef and diced onions in a large frying pan over medium-high heat with a dab of butter or margarine. While the beef is cooking, dump the ketchup, Worcestershire sauce, brown sugar and onion powder into a small mixing bowl. Stir well. Once the beef is fully cooked, drain the grease from the frying pan. Pour the sauce ...