In a food processor or blender, pulse 22 Oreos (including the cream filling) into a fine crumb. You can also place them in a zip-top bag and crush them into fine crumbs with a little arm muscle and a rolling pin. You should have about 2 cups (packed) crumbs, or 250g. Pour crumbs into a large bowl.

Add the melted butter and stir to combine. The mixture will be thick and quite wet. Try to smash/break up any large chunks.

Pour the mixture into an ungreased 8-inch, 9-inch, or 10-inch pie dish, cake pan, springform pan, or square pan. With medium pressure using your hand, pat the crumbs down into the bottom and up the sides to make a compact, thick crust. If the mixture seems really wet and is not forming a nice crust, grind up 2 more Oreos and mix those crumbs in. Tip: You can use a small flat-bottomed measuring cup to help press down the bottom crust and smooth out the surface, but do not pack down too hard. If making a pie, run a spoon around the bottom “corner” where the edge and bottom meet to help make a rounded crust⁠—this helps prevent the crust from falling apart when you cut slices.

For a baked dessert, pre-bake this crust per your filling recipe directions. I usually pre-bake for 8–10 minutes at 350°F (177°C). For a no-bake filling such as cookies & cream pie, bake for 10–12 minutes at 350°F (177°C). Cool the crust completely before using, unless your no-bake filling recipe instructs otherwise.