Preheat oven to 400 F. degrees. Grease or line muffin pan.
Combine, flour, sugar, salt and baking powder. Mix in oil, egg, vanilla and milk. Gently fold in blueberries. Fill muffin cups ¾ of the way full. Sprinkle the batter with ⅛ teaspoon of sugar on each cup.
Bake at 400 F. degrees for 19-25 mins.
Recipe by THE SEMISWEET SISTERS at http://www.thesemisweetsisters.com/2021/11/02/old-fashioned-blueberry-muffins/