Pre Heat oven ~ 350 degrees
Cream together butter, sugar. Beat in egg. Add milk.
Whisk together flour, baking powder and salt.
Fold in 1-1 1/2 cups blueberries.
Turn batter into greased muffin pan (12 cup)
Bake for approximately 25 minutes
While still warm from oven, brush with melted butter and sprinkle with coarse sugar.