Mix together the flour, sugar, and salt.
In a separate bowl (or glass measuring cup), whip together the oil and milk with a fork.
Add the oil mixture to the dry ingredients, and stir together with a fork until the flour is all moistened.
If you're making a fruit cobbler, save back about a third of the mixture to crumble on top of the pie.
Press the remaining dough evenly in a pie plate, covering the bottom and the sides.
If you want to crimp the edges, go right ahead. But there's no need if you don't want to.
And that's it, your no-roll pie crust is ready for filling. Bake according to the instructions for whatever type of pie you're making.