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Bring butter eggs and sour cream to room temperature.
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Combine flour, baking powder and baking soda; set aside.
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In a bowl beat butter with electric mixer on medium to high speed for 30 seconds.
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Gradually add sugar, beating about 10 minutes or until very light and fluffy.
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Add vanilla. Add eggs, one at a time, beating 1 minute after each addition and scraping bowl often.
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Add flour mixture and sour cream to egg mixture alternately, beating on low to medium speed after each addition just until combined.
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Add blueberries, beating on low speed for 30 seconds.
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Pour into a greased and floured 8x4x2 inch or 9x5x3 inch loaf pan.
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Bake in 325°F oven for 60-75 minutes or until a toothpick comes out clean.
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Cool on rack for 10 minutes. Remove from pan.