Makes 18 muffins (half recipe follows)
In a medium-sized bowl, beat together the softened butter and sugar until thoroughly combined.
Add the milk, eggs and vanilla, beating well after each addition.
In separate bowl, add in the flour, baking powder & salt. Stir until fully combined.
Add the flour mixture alternately with the milk mixture, stirring just enough to blend fully.
Crush 1/2 cup of the blueberries. Gently stir both the crushed as well as whole berries into the batter, stirring only enough to distribute.
NOTE: for a smaller batch, the half recipe follows below.