Pulse gingersnap cookies in a food processor until you have fine crumbs (about 2 cups). Add sugar and cinnamon and pulse a few times to combine. Pour melted butter over and pulse until mixture is well combined.
Transfer crumb mixture to a 9-inch, deep-dish pie pan and use a measuring cup to firmly press the mixture evenly onto bottom and up the sides. Bake 5 minutes. Transfer to wire cooling rack to cool completely. Fill as desired.