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Sift the flour through the cayenne pepper in a medium bowl, set aside.
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Put softened butter and ginger into a mixer fitted with the paddle attachment (or hand held mixer is fine) Mix on medium speed until lightened, about 4 minutes. Add brown sugar, mix till combined. Add molasses, mix till combined.
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Mix in the flour mixture in 2 batches, alternating with the baking soda mixture. Mix in chocolate chunks.
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Transfer dough to plastic wrap, and chill for at least 2 hours (or overnight)
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Preheat oven to 325F. Line 2 baking sheets with parchment. Roll the dough into 1- 1.5" balls. Lay out on sheets and chill in the fridge for 20 minutes.
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Bring the sheets back out to the counter, fill a small bowl with granulated sugar, and roll each ball in the sugar. Space the balls 2" apart on the sheets. Lightly press down with your fingers or a rubber spatula. Just a little.
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Bake until surfaces crack slightly, about 10-12 minutes. Let cool on the sheets for 5 minutes. Transfer to a wire rack and cool completely.
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They can be stored in an airtight container for up to 5 days.