Preheat oven to 400°F (200°C).

Grease or line muffin pans with cupcake liners.

In a large bowl, combine flour, sugar, baking powder, baking soda, salt, and cinnamon.

In a medium bowl, beat milk, melted butter, egg, orange juice concentrate, and vanilla until well blended.

Add the wet mixture to the dry mixture.

Mix lightly until just moistened.

Gently stir in blueberries until evenly distributed.

Fill prepared muffin cups 3/4 full.

Bake for 20-25 minutes, or until a toothpick inserted into the center comes out clean.

Cool in the pan for 5 minutes.

Remove muffins from the pan and place on a wire rack to cool completely.

Serve warm or at room temperature.