Mushroom Rice Unknown Source 1 can Beef bouillon soup 1 can French onion soup 1 stick Butter 2 8oz. cans of Mushrooms stems and pieces 1 1/2 cup Rice, uncooked Combine soups, butter, and mushrooms in a casserole dish. Heat in microwave until butter is melted. Add rice and bake uncovered at 350 degrees. When all liquid is absorbed, cover and cook until rice is tender.