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Preheat oven to 350°F Line a baking sheet with parchment paper.
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In a medium bowl, whisk together flour, baking soda, and salt.
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Melt butter in the microwave.
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In a large bowl, combine the warm melted butter with the cocoa powder. Whisk until smooth.
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Whisk in sugar, vanilla extra, and buttermilk.
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Gradually stir in the flour mixture until no streaks of flour remain.
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Stir in chocolate chips.
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Drop dough in 1-inch balls onto prepared baking sheet, leaving about 2 inches between cookies to allow for spreading.
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Bake 10-12 minutes until cookies are set around the edges.
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Cool for 2-3 minutes on a baking sheet, then transfer to a wire rack to cool completely.