Source: Jen of CincyShopper.com
Preheat oven to 375. Spray donut hole pan with nonstick spray.
Whisk together flour, baking powder and sugar.
Stir together egg, vanilla, milk and butter.
Add wet ingredients to dry ingredients.
Fill each hole 2/3 full and press 2 blueberries in each cavity. Bake 12 minutes then flip each hole and bake for another 3 minutes.
Serve with syrup, glaze or dusted in powdered sugar, if desired.