http://www.myrecipes.com/recipe/mini-blueberry-muffins

Ingredients

2 1/4 cups all-purpose flour 
1 1/2 teaspoons baking powder 
1/2 teaspoon cinnamon 
1/2 teaspoon salt 
2 large eggs 
3/4 cup milk 
2/3 cup vegetable oil 
1 1/4 cups sugar 
1 teaspoon vanilla extract 
1 cup blueberries (fresh or frozen) 

Preparation

1. Preheat oven to 375F. Mist 2 24-cup miniature-muffin tins with cooking spray.

2. In a bowl, mix flour, baking powder, cinnamon and salt. In a
separate bowl, whisk eggs, milk, oil, sugar and vanilla. Stir dry
ingredients gently into milk mixture. Fold in berries.

3. Spoon batter into muffin tins so they're 3/4 full. Bake until a
toothpick inserted into center of a muffin comes out clean, 15 to 20
minutes. Let cool in pans on wire racks for 5 minutes, then turn
muffins out onto racks. Serve warm.