In a large skillet over medium heat, cook and crumble the ground beef with the onion, green pepper, and mushrooms until the beef is fully cooked and no longer pink. Drain if needed.
1½ pounds lean ground beef, ½ medium onion, ½ medium green pepper, ½ cup fresh mushrooms
Stir in the pepperoni, pizza sauce, and oregano.
1 ounce sliced pepperoni, 1 can or jar pizza sauce, 1 teaspoon dried oregano
Simmer for 10-15 minutes, or until the mixture is heated through and slightly thickened.
Divide the mixture between the buns and top each sandwich with about 2 tablespoons of mozzarella cheese.
8 hamburger buns, 1 cup shredded mozzarella cheese
Serve immediately.
Notes
🥡 STORAGE
Store filling in an airtight container in the refrigerator for up to 3-4 days
Keep buns separate to prevent sogginess
♨️ REHEATING
Microwave - heat in 30-60 second intervals, stirring between each
Stovetop - warm in a skillet over medium heat until heated through
Oven - place in a covered dish at 350° until warmed through
❄️ FREEZING
Freeze filling only for up to 2 months
Thaw overnight in the refrigerator before reheating
💡 TIPS FOR BEST RESULTS
Chop vegetables finely for even texture
Simmer until slightly thickened for the best consistency
Toast buns to prevent soggy sandwiches
🍳 ALTERNATE COOKING METHODS
Slow cooker - brown meat first, then cook on low for 2-3 hours