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Preheat oven to 375 degrees. Spray a muffin tin with non-stick cooking spray, or you can line with liners.
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In a large mixing bowl, combine the buttermilk, oil, and eggs. Mix together using a plastic spatula.
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Mix in the sugar and vanilla extract.
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Mix in the flour ½ cup at a time until thoroughly mixed together. Fold in the cooca powder, salt, and baking powder.
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Pour the batter into the muffin tins ¾ of the way. Bake for 17 minutes and allow the muffins to cool for 2 minutes, then transfer to a cooling rack.