1. Fit steel knife blade into work bowl of a food processor. Process pecans until they are almost a powder, 15-20 seconds. 2. Add margarine or butter (do not use diet or soft margarine), flour and powdered sugar. Process about 5 seconds to mix well. 3. Pat mixture into a 9-inch pie plate. Bake in preheated 400-degree oven for 15 minutes until lightly browned. 4. Remove and cool completely before filling with cream or fruit pies that do not need further cooking.
