Step 1

Preheat the oven to 400°F. Spray 2 – 12 count mini muffin tins with nonstick spray.

Step 2

Stir together the flour, 1/2 cup sugar, baking powder, baking soda, and salt.

Step 3

Create a well in the center and add the egg, oil, sour cream, and vanilla. Mix together gently.

Step 4

Spoon one teaspoon batter into the bottom of the prepared muffin tins.

Step 5

Place a small spoonful of the blueberry preserves in the center of the batter.

Step 6

Use the remaining batter to cover the preserves.Bake for 10 minutes.

Step 7

Let cool in the pans for 2 minutes before gently removing them and placing them on a wire rack to cool completely.

Step 8

Dip the donut holes in the melted butter and roll in cinnamon sugar. Let set.