Preheat oven to 350℉ and grease 8 donut molds.
In a bowl, combine all wet ingredients until smooth. Mix in the dry ingredients until you have a smooth batter.
Fold in the blueberries. Alternatively, you can add the blueberries while filling the donut molds with batter if you want them more evenly dispersed.
Begin spooning the batter into the prepared donut molds. Bake for about 9-11 minutes or until a toothpick comes out clean. Let the donuts cool completely before topping with the optional icing. Enjoy!