Save all the bits & pieces of broken cookies (or extra cookies) in zip-lock baggies (can even store them in the freezer ~ mixtures of different cookies of just fine). Then crush them with a rolling pin, or toss them into your food processor with about 1 TB (or more, if you have more cookies) of CANNED FROSTING ~ whirl until they stick together. Then press them into the bottom and up the sides of the pie pan. You can refrigerate the crust while you get together the rest of the pie.
HOMEMADE COOKIE CRUST: Put about 10-12 sugar or sugar-free cookies (butter, vanilla wafers, oatmeal) into food processor with about 2 heaping TB sugar or sugar-free canned frosting. Pulse until crumbs that clump together. Pat down firmly into 8" or 9" pie pan.
This can also be done with sugar-free cookies & sugar-free frosting.