Blueberry Sour Cream Muffins

Ingredients:
1 cup sugar
1 stick butter, softened
2 eggs
1 cup mashed bananas
1/2 cup sour cream
2 cups flour
1 tsp baking soda
1/2 tsp baking powder
1/2 tsp cinnamon
1/2 tsp salt
1/2 tsp vanilla
2T milk
1 cup blueberries

Directions:
In large bowl, cream butter and sugar. Add eggs, bananas, and sour cream. Mix dry ingredients in a separate bowl. Gradually add dry ingredients and mix until smooth. Add milk and vanilla. Fold in blueberries. Fill muffin cups 2/3 full. Bake on 350 for 24 minutes.