Place flour, cocoa, sugar, and salt in the bowl of a food processor; pulse to combine. Add butter; pulse until mixture resembles coarse meal, about 10 seconds. Add yolks, cream, and vanilla; process until mixture comes together.
Turn out dough onto a piece of plastic wrap, and flatten into a disk. Wrap well; refrigerate at least 30 minutes or until ready to use, up to 2 days.
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