Preheat oven to 350 degrees F.
Grease a donut pan and sprinkle with extra flour to evenly coat all sides of the donut molds.
Stir all dry ingredients for the donuts together with a whisk
In a separate bowl, whisk all of the wet ingredients together until well mixed
Pour the wet ingredients into the dry and stir until combined, using a spatula to scrape down the sides
Pour batter, evenly, into the 6 molds
Bake for 15 minutes
Remove from oven and allow donuts to cool for 5 minutes in the pan
Place donuts on a cooling rack to continue to cool while you make the glaze
For the glaze:
Melt the butter in a microwave-safe bowl for a few seconds
Stir in maple sugar and allow to sit until sugar melts
Stir in vanilla powder and half and half and microwave for 10 more seconds until smooth and pourable
Drizzle glaze over the donuts and serve