This baked blueberry cake donut recipe makes donuts studded with juicy blueberries and coated in cinnamon sugar. Easy to whip up and so delicious!

In a large bowl whisk together the flour, baking powder, baking soda, and salt.

In a separate bowl whisk egg, milk, yogurt, sugar, melted butter, and vanilla extract until well combined.

Add the flour mixture into the wet ingredients. Fold the dry ingredients except for the blueberries into the wet until it's combined, but don't overmix. 

Add the blueberries and stir them in just a little, so there are still streaks of yellow batter.

Grease a donut pan. Scoop the batter into the pan. Fill the cavities about ¾ of the way. 

Bake the donuts until puffed and just lightly golden brown around the edges. They don't take long to bake. Let them cool in the tray for 5 minutes before removing so they don't break.

In a small bowl, mix together granulated sugar and ground cinnamon. Melt some butter in the microwave or on the stove.

Use a pastry brush to brush a donut on all sides with melted butter. Dip the donut in the cinnamon sugar until coated.