1 Cook the potatoes until soft. Drain. Beat them with a mixer until smooth.2 Spoon mixture into a sprayed 13X9-inch baking dish.3 Combine the flour and sugar in a food processor. Add the chilled butter or margarine and pulse until it resembles a coarse meal. Stir in the pecans and sprinkle over the potatoes.4 Bake uncovered in a 375℉ for about 30 minutes.