With a mixer, cream the butter and sugar until light and fluffy, about 5 minutes. Turn the mixer on low and add the eggs 1 at a time, mixing thoroughly after each egg. Then add the vanilla, sour cream and milk. Mix well. In a separate bowl, sift together the flour, baking powder, baking soda and salt. With the mixer on low speed, add the flour mixture to the batter and beat until just mixed. Fold in the blueberries with a spatula and be sure the batter is completely mixed.
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