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Preheat oven to 350 degrees.
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In a large bowl combine flour, sugar, baking soda*, baking powder*, and salt in a bowl.
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*NOTE: reduce baking soda and baking powder to 1/2 teaspoon for high altitude.
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In a separate smaller bowl, combine egg, egg white, butter, sour cream, and vanilla.
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Add dry ingredients to wet ingredients and stir until just moistened.
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Add mini chocolate chips and stir until well combined.
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Spoon into lined or non-stick mini muffin tins. This recipe will make 36 mini muffins.
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Bake for 10 minutes, cool in pan for 5 minutes, and then remove muffins to cooling rack.