Combine all the ingredients for the batter except the blueberries and mix well. Divide between twelve mini donut molds. Press a few blueberries into each donut. Small blueberries work best.
Bake for 25 min.
Meanwhile, make the glaze. Combine all the ingredients. Put it into a piping bag or ziploc bag and cut a tiny part of one corner off.
Cool the donuts and put them on a wire rack upside down. Drizzle the glaze over them. Store in the refrigerator. Warm in the oven or the microwave before serving to melt the glaze. I microwaved mine for thirty seconds.