In food processor, pulse graham crackers until fine crumbs form. Pulse in granulated sugar. In small microwavable bowl, microwave coconut oil on High until melted. Once melted, turn food processor on and pour in coconut oil until well mixed. Scrape down side of food processor if necessary to thoroughly combine mixture. Scrape graham mixture into ungreased 9-inch pie plate; press into bottom and side to form tart shell. Place shell in freezer to set up, about 10 minutes.