Step 1
Bring a large pot of water to a boil.
Step 2
Cook the peppers in boiling water until softened 4 to 5 minutes.
Step 3
Remove peppers from boiling water and rinse with cold water; set peppers aside to drain.
Step 4
Mix together ground beef cooked white rice lightly beaten egg finely chopped onion Italian-style bread crumbs salt black pepper garlic powder and 1/4 cup grated Parmesan cheese in a large bowl until evenly mixed.
Step 5
Preheat oven to 350 degrees F (175 degrees C).
Step 6
Divide beef and rice mixture among peppers; stuff each pepper with beef and rice mixture.
Step 7
Place peppers open side up in a 9x13-inch baking dish or shallow roasting pan.
Step 8
Combine tomato sauce and white vinegar in a bowl.
Step 9
Pour tomato mixture over stuffed peppers.
Step 9
Top with 2 tablespoons grated Parmesan cheese.