In a medium mixing bowl, combine the flour, sugar, cocoa powder, chocolate chips, and baking soda.
In a small bowl, beat together the vanilla, egg, sour cream, milk, and oil.
Stir the wet ingredients into the dry until just combined.
Spoon in a buttered donut pan.
Bake for 8 minutes or until the tops spring back when you touch them.
Let the donuts cool in the pan before removing or glazing.
I made my donuts without the glaze, but if you'd like it, here's the instructions:
To make the glaze:
In a small saucepan over low heat, combine the sugar, milk, and vanilla until well combined. Remove from the heat. Spread over donuts and let dry before consuming.