Preheat oven to 375°F and spray mini donut pan with nonstick spray.

In a small bowl combine flour, sugar, cocoa powder baking soda and salt. Set aside

In a medium Bowl whisk together egg, sour cream, oil, 1/4 cup milk and vanilla until smooth.

Stir in the dry ingredients to the wet ingredients until JUST combined. Don't overmix

Using a Piping Bag or a Ziploc bag, fill each mini donut well about halfway.

Baked in the oven for 8 minutes, or until a toothpick runs clean when inserted.

Combined three tablespoons of milk, with one cup of powdered sugar and vanilla extract. Dip each donut, set on wire rack to cool completely