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Preheat oven to 375.
Grease your donut pans and set aside.
Combine your dry ingredients (flour, sugar, baking powder, and cinnamon in a large mixing bowl.
Add egg, buttermilk, and melted butter. Stir until just combined. (Do not overmix). Gently fold in blueberries.
Using a spoon, fill each donut pan 2/3 full.
Bake for 15-17 minutes or until golden brown.
Combine the ingredients for the glaze and whisk until smooth.
Remove the donuts from the oven and allow to cool for 5 minutes before removing them from the pan. Drizzle glaze over the still-warm donuts and allow to cool before storing in an airtight container.