Preheat oven to 400 degrees.
Prep the bell peppers. Cut the top off then cut solid rings about 1/2 inch thick. Set aside. Depending on how big or small your peppers are, you may need 2 or 3 bell peppers.
In a large mixing bowl, mix together the ground beef, diced onion, Italian seasoning, red pepper flakes, salt, pepper, dried basil, chopped garlic, Worcestershire sauce, ketchup, eggs and bread crumbs. Mix with hands, and don't over mix or the meat becomes tough.
On a large baking sheet lined with foil, spray cooking spray, then lay out the bell pepper rings.
Form the meat into patties as thick as your rings and fill each ring with meat.
Bake in the oven at 400 degrees for 20 minutes.
Remove from oven when done. Sprinkle the top with shredded Parmesan cheese the broil for a few minutes until the cheese starts to slightly brown, then remove from oven.
Serve with mashed potatoes. Enjoy!