Low Fat Blueberry Muffins

1/4 cup non fat plain yogurt
1/2 cup white sugar
1 egg
3/4 cup 2 % milk
1 tsp vanilla
1 3/4 cups all-purpose flour
1 tblsp baking powder
1/2 tsp salt
1 cup fresh or frozen blueberries

cream yogurt, sugar, and egg, add milk and vanilla stir in flour, baking powder and salt, till lumpy gently stir in blueberries and put batter into pans 

Bake in 400 degree oven for 20-25 minutes until done