In a food processor, process Oreos until no chunks remain. Add 1/2 cup hot fudge sauce and process until it comes together, almost like a dough. Press the oreo mixture onto a 12 inch pizza pan (lined with waxed paper if desired) and place in the freezer. Place your ice cream in a bowl and let sit on counter for 10 minutes until slightly soft and just spreadable. Remove the crust from the freezer and spread on the ice cream. Swirl with remaining hot fudge and sprinkle with M&M's. Freeze until firm. Serve immediately upon removing from freezer. The ice cream layer is thin which means it melts more quickly.
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