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Preheat oven to 350.
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Sift together flour, cocoa powder, baking soda, and salt; set aside.
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In your mixer's bowl combine butter and sugar; with your mixer on medium-high, cream until pale and fluffy.
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Add eggs, one at a time, mixing after each addition.
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Add vanilla and continue to mix.
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Set mixer on low and gradually add in flour mixture, mixing until just combined.
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Gently fold in chocolate chips and white chocolate chips.
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Using a cookie scoop, add 1 tablespoon portions to an ungreased baking sheet.
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Bake for 10 to 12 minutes, or until cookies are just starting to brown around the edges.
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Let rest for 2 minutes, then remove and let cool on a baking rack.
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Serve.