Preheat oven to 425 F. Lightly grease a donut pan with cooking spray and set aside.
In a large bowl, combine the flour, coconut sugar, baking powder, and cinnamon.
In a separate bowl, whisk together the milk, egg, coconut oil, and vanilla.
Pour the wet ingredients into the dry ingredients, and stir the mixture together until just incorporated.
Fold in the fresh blueberries
Use a piping bag, or a spoon, to evenly pour the batter into the donut pan, filling the tins about 3/4 of the way.
Bake for about 8-10 minutes, until a toothpick inserted in the center comes out clean.
Cool donuts completely on a wire rack before dipping them in icing.