Berlinda's Blueberry Protein Muffins

Recipe
    - 1 1/2 cups all-purpose flour
    - 
    3/4 cup granulated sugar, plus 1 tablespoon for muffin tops
    - 
    1/4 teaspoon fine sea salt
    - 
    2 teaspoons baking powder
    - 
    1/3 cup neutral-flavored oil; canola, vegetable and grape seed are great
    - 
    1 1/2 teaspoons vanilla extract
    - 
    6 to 8 ounces fresh or frozen blueberries (about 1 cup)
Directions 
Heat oven to 400 degrees.
Divide the batter between muffin cups. Sprinkle a little sugar on top of each muffin.
Bake muffins 15 to 20 minutes or until tops are no longer wet and a toothpick inserted into the middle of a muffin comes out with crumbs, not wet batter. Transfer to a cooling rack.