01 - 
                In a large skillet, brown the ground beef over medium heat until fully cooked. Drain any excess grease.
              
              
              
                02 - 
                Transfer the browned ground beef to the bottom of a slow cooker. Stir in the pizza sauce and sliced pepperoni.
              
              
              
                03 - 
                Cover the slow cooker and cook on low for 3 hours, allowing the flavors to meld together.
              
              
              
                04 - 
                After 3 hours, sprinkle the shredded mozzarella cheese over the beef mixture in the slow cooker. Cover and cook for an additional 30 minutes, or until the cheese is melted and bubbly.
              
              
              
                05 - 
                Spoon the pizza-flavored beef mixture onto the rolls. Top each with a slice of mozzarella cheese.
              
              
              
                06 - 
                Serve the Crockpot Pizza Burgers hot, and enjoy the delicious combination of burger and pizza flavors!.