1-1/2 pounds ground beef
1/4 cup chopped onion
1 can (15 ounces) pizza sauce
1 can (4 ounces) mushroom stems and pieces, drained
1 tablespoon sugar
1/2 teaspoon dried oregano
6 hamburger buns, split and toasted
1-1/2 cups shredded part-skim mozzarella cheese
In a large skillet, cook beef and onion over medium heat until the meat is no longer pink, 3-5 minutes, breaking into crumbles. Drain. Stir in the pizza sauce, mushrooms, sugar and oregano; mix well. Spoon onto buns; sprinkle with mozzarella cheese.
Place on ungreased baking sheets. Broil 4 in. from the heat until cheese is melted, 2 minutes.
To freeze for quick lunches later, place the split and toasted buns on a baking sheet. Spoon the meat mixture onto buns; freeze for 1 hour. Transfer to freezer-safe airtight containers.
To use frozen burgers: Thaw completely in the refrigerator. Sprinkle with cheese. Broil 4 in. from the heat until heated through and cheese is melted, 2 minutes.