To make ten, I cut the tops off the green peppers, cleaned them out and then mixed the following ingredients together in a bowl:
2 lbs ground beef
1 cup GF oats
1 pkg Knorrs Vegetable recipe mix
1 medium onion, diced
1 cup salsa
I lined a cookie sheet with foil, sprayed it with cooking spray and then stood the peppers in the pan. (Some needed to be sliced off carefully at the bottom so they would stand up straight.) I spooned the hamburger mixture into the peppers and smashed down a bit, then topped with ketchup (probably one or two Tbsp each). They cooked in a 400 degree oven for 1 hour.