For many families, a special dinner just wouldn't be complete without mashed sweet potatoes topped with miniature marshmallows and chopped pecans. But you need not relegate this hardy, healthy tuber to a once-a-year treat. In addition to casseroles galore, you can find recipes for preparing baked, boiled, roasted, mashed, pureed, sautéed and fried sweet potatoes. There are also sweet potato desserts and sweet potato soups. For the most part, you can interchange sweet potatoes, particularly the pale variety, in recipes calling for white potatoes.