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In a medium bowl, whisk together the flour, cocoa powder, and salt. Set aside.
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In a separate bowl, beat the butter and sugar until light and fluffy. Add the egg and vanilla and beat until incorporated.
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Add half of the flour mixture and mix on low speed until combined. Add the remaining half of the flour and mix until combined.
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Roll the dough into a large ball and then flatten into a disk. Wrap in plastic wrap and refrigerator for 30-60 minutes.
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Preheat the oven to 350 F. Line two baking sheets with parchment paper.
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Transfer the dough to a floured surface and roll out to ⅛ - ¼ inch thickness.
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Cut out the cookies using a small to medium round or fluted round cookie cutter.
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Cut out a small heart in the center of half of the cookies.
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Transfer the cut-out cookies to the prepared baking sheets and place in the refrigerator for 15 minutes.
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Bake cookies for 12 minutes or until the edges are beginning to brown. Let cool for a couple minutes on the baking sheet before transferring to a wire rack to cool completely.