Pizza Burgers Recipe

Ingredients

• 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