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Preheat oven to 350 F.
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Line Muffin pan with paper liners.
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In a small bowl, mix together flour, cocoa, baking soda, and salt.
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In a large bowl, whisk together sugar, oil, egg and vanilla until smooth.
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Alternate adding flour mixture and buttermilk, starting with flour. Making three additions of flour mixture and two additions of buttermilk. (Flour, Buttermilk, Flour, Buttermilk, Flour) beating until batter is smooth.
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Stir in chocolate chips.
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Scoop batter into prepared pan.
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Bake for 22-27 minutes or until top of cupcakes spring back when lightly touched.
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Let cool in pan on rack for 10 minutes, then remove from pan and let cool completely on rack.
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Frost when completely cooled.