SAUCE

1/2 cup butter, softened
3/4 cup sugar
1/4 cup packed brown sugar
2 eggs
2 cups all-purpose flour
1 teaspoon baking powder
1/2 teaspoon baking soda
1 cup sour cream
1 pound bulk pork sausage, cooked and drained
1 cup fresh or frozen blueberries
1/2 cup chopped pecans
BLUEBERRY SAUCE:
1/2 cup sugar
2 tablespoons cornstarch
1/2 cup water
2 cups fresh or frozen blueberries