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Preheat oven to 350 degrees F.
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Line muffin pan with paper liners.
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In medium bowl, blend together butter, sugar, eggs, milk, and vanilla.
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In large bowl, sift together flour, baking powder and salt.
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Pour butter mixture into dry ingredients and mix well.
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Fold blueberries into mixture carefully berries aren't crushed.
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Spoon muffin mix into paper liners.
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Bake for 25 to 30 minutes depending on how full the liners are, I like to overfill a little because the top of the muffin is my favorite part but it may take a little longer to cook depending on the oven.