Whisk together the flour, salt, sugar and baking powder., Whisk together the oil and water, then pour over the dry ingredients., Stir with a fork until the dough is evenly moistened., Pat the dough across the bottom of the pie pan and up the sides. A flat-bottomed measuring cup or glass helps smooth the bottom., Crimp the edge, or flatten with the tines of a fork., Fill the crust as desired, and bake., Yield: one 9" no-roll pie crust.