Blueberry Coffee Cake Muffins

Yeild: 12 - 18 muffins

1 1/2 sticks butter
1 1/2 c sugar
3 large eggs
1 1/2 tsp vanilla
1 c sour cream
1/4 c milk
2 1/2 c flour
2 tsp baking powder
1/2 tsp baking soda
1/2 tsp salt
1 pint blueberries

Preheat oven to 350.
Cream butter and sugar until pale and fluffy. Add eggs one at a time. Add vanilla, milk and sour cream. Scrape down bowl. Mix dry ingredients in a separate bowl. Add flour mixture to butter mixture just until incorporated. Fold in blueberries by hand. Spray muffin pan with cooking spray. Fill cups just over the top. Bake for 25 - 30 min, rotating half way through.