Blueberry Lemon Coffee Cake

1 cup butter or margarine, softened
1 cup sugar
3 eggs
1 cup sour cream
1 teaspoon vanilla extract
juice and zest of one lemon (I think next time I may even do juice from 1 1/2 lemons)
2 1/2 cups all-purpose flour
2 1/2 teaspoons baking powder
1 teaspoon baking soda
1/8 teaspoon salt
Blueberries fresh or frozen

In a mixing bowl, cream butter and sugar. Add eggs, one at a time, beating well after each addition. In another bowl, mix sour cream, vanilla, lemon juice and zest. Combine flour, baking powder, baking soda and salt; add to creamed mixture alternately with sour cream mixture. Mix well. Spread in a greased 13-in. x 9-in. x 2-in. baking pan. Sprinkle blueberries on top of batter according to taste. We like lots of berries on top. Bake at 350 degrees F for 30-35 minutes or until cake tests done.

I think this would also taste good with raspberries instead of blueberries!