Preheat oven to 350°F. Prepare rice according to packaged directions.
Dice green peppers and onions. In a large skillet, add ground beef, green peppers, and onion. Cook over medium heat until beef is no longer pink. Drain mixture and return to skillet. Add cooked rice, marinara sauce, Italian seasoning, garlic powder, and cheese. Stir to combine. Spoon mixture into a 9x13 baking dish.
In a small bowl, combine bread crumbs and olive oil. Sprinkle bread crumbs over top of ground beef mixture.
Bake for 8-10 minutes, or until heated through and bread crumbs are golden. Serve immediately.