Preheat the oven to 400 degrees F.
In an electric mixer, cream the margarine and sour cream. Add the flour and mix well. Drop large spoonfuls of the dough into a muffin pan that has been sprayed with cooking spray or lined with muffin cups. Bake for until the tops of the muffins are golden brown, 15 to 20 minutes.
For smaller muffins, use mini muffin pans and reduce the baking time to 10 to 12 minutes.
Recipe adapted from Home Cooking with Trisha Yearwood (c) Clarkson Potter 2010