Pizza Burgers
["1 lb. ground beef", "1/2 c. chopped onion", "1 (6 oz.) can tomato paste", "1 tsp. salt", "1 tsp. oregano", "1/4 tsp. garlic powder", "6 buns, split, toasted and buttered", "Mozzarella cheese, sliced or shredded"]
["Brown beef and onion; add paste and seasonings.", "Simmer uncovered for 15 minutes.", "Spoon onto buns.", "Top with cheese. These open-faced sandwiches can be placed in a 400\u00b0 oven until cheese melts."]
["ground beef", "onion", "tomato paste", "salt", "oregano", "garlic powder", "buns", "Mozzarella cheese"]