Pulverize graham crackers in food processor until finely ground into crumbs (skip this step if starting with graham cracker crumbs).
Stir together graham cracker crumbs and sugars in a medium-sized bowl.
Add melted butter and use a fork to combine ingredients well until crumbs are all moistened.
Pour mixture into pie plate or springform pan.
Use the (clean!) bottom of a measuring cup to firmly pack crumbs into the bottom of the pan and (if using a pie pan) gently press up the sides.
Use your fingers to pack crumbs tightly into the sides of the pie pan.
If the crust needs to be pre-baked, bake on 350F (175C) for 10-13 minutes and allow to cool before filling.
If using this crust as part of a different recipe, bake according to your recipe's instructions.
If this crust is for a no-bake recipe, refrigerate or freeze for 10-20 minutes before filling.
