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["Preheat the oven to 415. Blitz the oreo cookies in a food processor until crumbly and pea-sized, but not too small. Pour into a small ball and stick it in the freezer.", "Add the flour, salt, sugar, and baking powder to the food processor. Pulse twice to combine. Cut the butter into the butter in small chunks. Pulse 6-7 times. Put the butter-flour mixture into the freezer.", "In a large mixing bowl, combine the cream, egg, vanilla, and zest. Whisk until well-blended.", "Remove the cookies and butter-flour mixture from the freezer and dump *on top of* the cream and egg mixture. Fold the ingredients together until a shaggy dough forms. Turn the dough out onto a floured surface and pat the dough together with a pastry scraper into a 2.5"" high by ~8"" wide circle. DO NOT OVERWORK THE DOUGH! It should just barely hold together.", "Using a round 3"" pastry cutter, cut 8 equal circles, reworking the dough into a round when you run out of space.", "Flip the rounds upside down and transfer the rounds to a greased or parchment-lined cookie sheet. Brush the tops with the wash of your choice (egg for shininess, cream for a matte finish) and sprinkle the tops with turbinado sugar.", "Place the cookie sheet into the center rack of the oven and immediately reduce the heat to 400. Bake for 12-14 minutes or until lightly golden on the tops.