Preheat oven to 350 degrees
Cut tops off peppers and take out center stems. Chop remaining top to add to meat mixture.
Brown meat, onion and chopped pepper tops in skillet.
Stir in rice, salt, garlic powder, and 1 can of tomato sauce.
Spray 9x9x3 pan with cooking pray and line bottom with 1/2 of the sliced peppers
Scoop 1/2 meat mixture into pan
Make another row of the rest of the stuffed peppers
Add remaining mixture on top of the peppers
Pour the second can of tomato sauce over the mixture
Cover with foil and Bake for 45 minutes
Uncover and cook for another 10 mins
remove from oven and serve