Stuffed Bell Peppers

Collect and prepare all necessary ingredients. Heat a large pot of water until it reaches its boiling point.

Add sliced peppers to the boiling water and cook for 4-5 minutes, or until they become tender. Remove peppers from the pot with a colander and rinse under cold running water to stop the cooking process.

Combine ground beef, cooked rice, bread crumbs, 4 tablespoons of grated Parmesan cheese, chopped onion, beaten egg, garlic powder, salt, and pepper in a large mixing bowl until everything is well incorporated.

Preheat your oven to 350 degrees Fahrenheit (175 degrees Celsius). Fill each pepper with the meat mixture, making sure it's evenly distributed.

Arrange peppers in a baking dish so that their fillings are facing upwards. In a separate bowl, mix together tomato sauce and vinegar until well combined.

Pour the tomato sauce mixture over the peppers in the baking dish. Sprinkle any remaining 2 tablespoons of grated Parmesan cheese on top.

Place the peppers in the preheated oven and periodically baste them with the sauce to ensure even cooking. Continue baking until the beef filling reaches a safe internal temperature of at least 160 degrees Fahrenheit (70 degrees Celsius), which should take around 1 hour and 20 minutes.