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Sift together the cocoa powder, flour and salt in a large bowl.
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Using a mixer, cream the butter and sugar.
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Add the eggs one at a time, then the vanilla, incorporating each ingredient before adding the next.
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Add the dry ingredients and mix just until incorporated, scraping the bottom of the bowl with a rubber spatula.
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Divide the dough into 4 parts, filling your skillet or oven-safe bowl with one part of the dough.
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Bake at 350 degrees for 20 minutes, or until cookie doneness is achieved.
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Serve warm, with a large scoop of mint chocolate chip ice cream on top!