Ingredients for Drop Dumplings: 1 cup flour; 1½ teaspoons baking powder; ½ teaspoon salt; ½ teaspoon sugar; 1 egg; ½ cup milk. How to. Dumplings: Mix 2 cups Bisquick and ⅔ cup milk until soft dough forms. Drop dough by spoonfuls onto stew (do not drop directly into liquid). Here's what you'll need to make tender, flavorful flat dumplings. A collage of ingredients to make flat dumplings: all-purpose flour, baking powder.