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 daysKeep buns separate to prevent sogginess♨️ REHEATING: Microwave - heat in 30-60 second intervals, stirring between eachStovetop - warm in a skillet over medium heat until heated throughOven - place in a covered dish at 350° until warmed through❄️ FREEZING: Freeze filling only for up to 2 monthsThaw overnight in the refrigerator before reheating💡 TIPS FOR BEST RESULTS: Chop vegetables finely for even textureSimmer until slightly thickened for the best consistencyToast buns to prevent soggy sandwiches🍳 ALTERNATE COOKING METHODS: Slow cooker - brown meat first, then cook on low for 2-3 hoursOven - keep warm in a covered baking dish at 300°♻️ LEFTOVERS: Use filling for baked potatoesSpoon over pasta for a pizza-style meal📝 NOTES: Use lean ground beef to reduce greaseAdjust pepperoni to taste