Preheat oven to 375

Grease 18 regular-size muffin cups

Mix butter until creamy

Add sugar and beat until pale and fluffy

Add eggs one at a time, beating after each

Beat in vanilla, baking powder, and salt

Add half of the flour and half of the milk; stir

Add in the rest of the flour and milk; mix

Carefully mix in blueberries

Put in muffin cups and sprinkle topping onto each

Bake 15-20 minutes or until golden brown