In a skillet saute the onion in a small amount of olive oil. Add the sausages and break them up into small pieces.Add the garlic. Cook thoroughly, about 4-5 minutes. Transfer the sausage into a bowl. Add the tomato sauce, cheese and cous cous. Mix together. Stuff into prepared peppers and top with extra cheese. Bake at 350°F for 30 minutes. Enjoy for a great Halloween or simple supper. Bon Appetit.