These blueberry cake donuts are the definition of what a blueberry donut should be! They are made with freeze dried and fresh blueberries for the ultimate blueberry flavor.
In a large mixing bowl or stand mixer with the paddle attachment cream butter, oil and sugar. Add in egg and vanilla extract.
With a food processor add in the freeze-dried blueberries and grind until the blueberries are fine. This step can also be done with a Ziplock bag but will not be as fine.
In a separate medium bowl add in all the dry ingredients, freeze-dried blueberry powder and whisk until all the dry ingredients are combined and then add into the wet ingredients.
Combine the wet and dry ingredients until just combined leaving some dry pockets. Add the sour cream and crushed blueberries and fold into the batter with a rubber spatula.
Grease donut cavities well, add donut batter into a piping bag and pipe until ⅔ full
Bake donuts at 350F for 14 to 16 minutes or until the sides of the donuts are golden brown.
Once done allow them to cool for 5 minutes and then turn them out onto a wire cooling rack to allow them to fully cool. Repeat for the rest of the batter, this recipe should make 8 to 10 donuts depending on how full you fill the pan.
Glaze:
Mix together powdered sugar, melted butter, vanilla and milk until smooth.