1. Preheat the oven to 350 degrees Fahrenheit. Grease two doughnut pans.
2. Stir flour, sugar, cocoa powder, baking powder, and salt in a mixing bowl. Add coffee whitener, egg, oil, and vanilla and whisk until smooth. Transfer the batter to a piping bag or Ziploc bag. Snip the corner to form a small hole and pipe the batter into the pans, until just about filled. Bake for 11-13 minutes (or three minutes in a preheated doughnut machine). Transfer to a cooling rack.
3. For the glaze, place chocolate chips, margarine, corn syrup, and water in a medium bowl. Microwave for 20-second intervals, stirring between each, until completely melted and smooth. Dip doughnuts (or just the tops) into the chocolate glaze and top with toppings of your choice.