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Preheat the oven to 170c degrees and arrange paper cups in a muffin pan.
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In a bowl, mix eggs, sour cream, milk, oil, sugar, salt and coffee until you get a uniform mixture.
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Add flour, cocoa and baking powder and mix until combined.
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Add 3/4 of the chocolate chip and mix until evenly dispersed in the batter.
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Fill the muffin pan about 3/4 of each outlet height.
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Sprinkle the remaining chocolate chips at the top of each muffin.
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Bake the muffins for 15-25 minutes or until set and fully baked.
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Cool completely at room temperature and serve.