Grease the donut maker (with oil or butter) and preheat. Finely chop or dice chocolate (optional). Mix the flour and baking powder
Take a whisk and briefly mix the sugar, egg and butter vanilla flavor together. Then add the milk and oil, mix briefly and add flour mixture. Mix in chopped or diced chocolate. Bake in the donut maker for 3-4 minutes and loosen carefully.
You can eat the donuts like that or decorate them with icing or chocolate!