Onion Potatoes 5 lb-round white potatoes washed and cubed, not pealed 2 envelopes instant onion soup mix 1 stick of butter, not margarine 1 half size foil pan Place diced potatoes and melted butter in foil pan. Sprinkle with envelopes of onion soup mix and stir to coat potatoes. Place in a medium heated gas grill and close lid, or 350 degree oven and cook for about 1 hour stirring every 20 minutes.