Preheat the oven to 375 degrees Fahrenheit.
Grease a 6 cavity donut pan and set aside. Whisk together all wet ingredients in a mixing bowl.
Whisk in the dry ingredients, the batter will be fairly thick. Be sure to spoon and level the flour, don't scoop right from the bag.
Fold in the blueberries.
Scoop into your prepared pan. The batter will be thick. It helps to use the back of a greased spoon to smooth things out.You'll need about 1/4 cup of batter per donut.
Bake for 9-13 minutes or until the tops are just golden brown and a toothpick comes out clean.
Let cool in the pan for 10 minutes, then flip onto a wire rack to finish cooling.
Once cool, combine the ingredients for the glaze in a bowl. Whisk until smooth, adding more milk as needed to thin or more powdered sugar to thicken.
Once the donuts have cooled, dip in the glaze and enjoy!