Blueberry Coffee Cake - cooking recipe

Ingredients

1/2 c. butter or margarine, softened
1 c. sugar
2 eggs
2 c. all-purpose flour
1 tsp. baking powder
1/2 tsp. baking soda
8 oz. carton commercial sour cream
1 tsp. vanilla extract
1 c. frozen or fresh blueberries
1 Tbsp. sugar
1 tsp. ground cinnamon
powdered sugar (optional)

Preparation

Cream butter; gradually add 1 cup sugar, beating well at medium speed on mixer.
Add eggs, one at a time, beating after each addition.