In a large bowl, combine all dry ingredients (flour, sugar, baking soda, baking powder, salt, and nutmeg).
In a medium bowl, beat one egg, then combine all wet ingredients (heavy whipping cream, greek yogurt, melted butter, vinegar, vanilla extract, and blueberries).
Stir the wet ingredients into the dry ingredients until evenly distributed.
Pour batter into a piping bag, then pipe into 12-count mini donut pan (non-stick) until each donut is halfway filled.
Bake for approximately 10 minutes.
While that is baking, combine all topping ingredients (powdered sugar, blueberries, hot water, and food coloring). Stir well and set aside.
Once donuts have cooled at least five minutes, drizzle with the topping and serve. Enjoy!
Notes
Did you know eating as little as one serving of blueberries every week may slow the onset of cognitive impairment by several years (according to the Annals of Neurology)?