Basic Crumb Crust
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Crumb crusts are even easier than press-in cookie crusts. You don’t even have to bake them—see the variation at right. The crumbs can be made out of cookies, crackers, cereal, pretzels, even potato chips! Sometimes sugar or other flavorings are added to the crumbs (here the sugar is optional), and then fat (usually melted butter) is added to bind the mixture to form a crust. The crumbs can be coarse, for a crunchier texture, or finer, for a smoother texture. Different base ingredients will behave differently, so the first time I test a crumb crust with a new ingredient, I always have a little extra on hand in case I need more crumbs, or a little extra melted butter, should it be needed.
Crumb crusts don’t generally require chilling before baking, but you can refrigerate for up to 1 hour or freeze for 15 minutes, if desired, to firm them up before baking.