For the donuts: 1 cup flour 1/2 cup sugar 1/4 cup cocoa powder 1/4 cup mini chocolate chips (optional) 1/2 teaspoon baking soda 1/2 teaspoon vanilla extract 1 egg 6 tablespoons sour cream 1/4 cup milk 1/4 cup vegetable oil For the glaze: 1 1/2 cups p