Cream butter and sugar together well until light and fluffy. Beat in the egg. Stir in the flour. Roll into pie or tartlet crusts.
Bake at 350◦F for 10-20 minutes depending on size and thickness.
To avoid inflating, the crust may be weighed down with pie weights, but uncovered for the last five minutes of baking.
Bake slightly longer if the filling does not need to be baked.