Heat the olive oil over medium heat. Add the ground beef and cook until no longer pink. Transfer to a platter or bowl using a slotted spoon. Drain off all but 1 tablespoon fat.
Return the pan to the heat and add the onion. Cook until softened, approximately 2-3 minutes.
Stir in the garlic and cook for 1 additional minute.
Add the tomato paste, Italian seasoning, garlic powder and onion powder, stirring to coat the onions. Continue to cook for 2-3 more minutes.
Stir in the rice, tomatoes, tomato sauce and return the beef to the pan. Simmer for 5 minutes.
Prep the peppers buy cutting off the tops and removing the seeds/cores.
Arranget the peppers cut side up in a 9x13 inch baking dish and drizzle with olive oil.
Fill each pepper with the beef mixture. Sprinkle with cheese and bake for 35 minutes covered with foil.
Uncover and bake for 10 more minutes until the cheese is bubbling and the peppers are tender.
Garnish with parsley and parmesan cheese before serving.
Notes
Bell peppers can be stuffed up to 24 hours in advance. Cover and store in the refrigerator until ready to cook.