Into a mixing bowl sift the flour, measure 2 cups and resift 3 times with the baking powder, salt and sugar. Add the bacon. Beat the egg with the milk and melted fat. Add the milk mixture to the flour, stirring just until it is dampened. The batter should be somewhat blended but not too smooth. Spoon into greased muffin cups, filling each 2/3 full. Bake at 425 F. for 20 minutes or until brown. Serve hot!