01 - 
                In a large cast-iron or heavy skillet, combine the ground beef and chopped onion. Cook over medium heat until the beef is browned and no longer pink, taking about 3 to 5 minutes. As you cook, gently break the beef into crumbles using a spatula or wooden spoon. Once cooked, drain any excess fat.
              
              
              
                02 - 
                Stir in the pizza sauce, drained mushroom pieces, sugar, and dried oregano. Mix well to combine, ensuring the meat is fully coated with the sauce and spices.
              
              
              
                03 - 
                Spoon the savory mixture onto the toasted hamburger buns, dividing evenly.
              
              
              
                04 - 
                Generously sprinkle shredded mozzarella cheese over each topped bun.
              
              
              
                05 - 
                Arrange the assembled burgers on ungreased baking sheets, then place under a broiler, about 4 inches from the heat source.
              
              
              
                06 - 
                Broil for approximately 2 minutes, or until the cheese is bubbly and delightfully melted.
              
              
              
                07 - 
                Serve your Pizza Burgers hot and enjoy the comforting flavors of pizza and burger combined!.