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Preheat the oven to 350°F
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Grease a baking sheet well.
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Place the flour, cocoa, and powdered sugar in a food processor.
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Turn the machine on and slowly add the butter, 2 tablespoons at a time.
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Add the vanilla and process until the dough forms a ball on top of the blades.
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In the palms of your hands, roll the dough into circles about 1/2 inch thick.
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Place on the prepared baking sheet and press each circle of dough down with the bottom of a glass until it is about 1/4 inch thick.
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Sprinkle the dough with the granulated sugar and pecans and press again to flatten.
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Bake the cookies until brown, about 10 minutes.
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Cool them on the baking sheet before serving.