Preheat oven to 350o F

Wash peppers. Using a sharp knife cut off the top of each pepper. Set tops aside. Remove seed and membranes from inside peppers. Be sure to clean out all of the seeds. Using a pairing knife cut the faces into each pepper.

Over medium heat add oil to a large pan or dutch oven. Add onion and cook 2-3 minutes or until translucent.

Next, add ground beef, cook another 4-5 minutes or until no longer pink. Drain excess grease.

Return pan to stove, add tomatoes, tomato sauce, orzo, chicken stock, and seasonings. Simmer uncovered on low for approximately 10-12 minutes. Stir in 1 cup of cheese.

Fill prepared peppers with the ground beef mixture, topping each pepper with additional cheese.

Place peppers and lids in an oven safe casserole dish. Cover with foil. Bake for 30-35 minutes or until peppers have softened.