Prepare your equipment. Grab a 9-inch pie plate and ensure it's clean and dry.
In a medium mixing bowl, whisk together the flour, sugar, and salt.
In a separate small bowl or measuring cup, combine the oil and milk (don't stir these together yet).
Pour the oil and milk over the flour mixture all at once, then stir quickly with a fork until the mixture forms cohesive crumbs.
Dump the entire dough mixture into your pie plate. Using your fingertips, press the dough evenly across the bottom and up the sides of the plate. Start from the center and work outward, ensuring an even thickness of about ⅛-inch throughout.
For a decorative edge, press with the tines of a fork or pinch between your fingers.
For optimal results, refrigerate the prepared crust for 30 minutes before baking.
For pre-baking (blind baking): Prick the bottom and sides with a fork several times, then bake at 425°F for 15-18 minutes or until golden brown.