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fatnhappychef
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Gather all ingredients. Bring a large pot of water to a boil.
Add peppers and boil until softened, 4 to 5 minutes. Transfer peppers to a colander and run under cold water to cool.
Mix ground beef, cooked rice, bread crumbs, 4 tablespoons Parmesan, onion, egg, garlic powder, salt, and pepper together in a large bowl until well combined.
Preheat the oven to 350 degrees F (175 degrees C). Spoon beef mixture into peppers.
Place peppers into a baking dish with the stuffing facing up.
Stir tomato sauce and vinegar together in a bowl. Pour tomato sauce mixture over peppers.
Sprinkle remaining 2 tablespoons Parmesan over top.
Bake in the preheated oven, basting peppers with sauce several times, until beef filling is no longer pink in the center, about 1 hour 20 minutes. An instant-read thermometer inserted into the center should read at least 160 degrees F (70 degrees C).