Preheat oven to 350°F

Soften butter. Stir butter and sugar together until mixture is light.

Whisk in eggs and vanilla extract.

In a separate bowl, mix together dry ingredients.

Alternate whisking in the dry mixture and milk.

Crush 1/2 a cup of blueberries and stir them into the mixture. Fold the remaining blueberries in.

Sprinkle sugar on top of muffins and bake at 350°F for 20-30 mins.