DaBomB.com Blueberry Muffins with a Cinnamon/Sugar Crusted Top

1 1/2 cups all-purpose flour 3/4 Cup White Sugar 1/2 teaspoon salt 2 teaspoons baking Powder 1/3 cup vegetable oil 1 egg 1/3 cup milk 1 cup fresh blueberries 1/2 cup white sugar 1/3 cup all-purpose flour 1/4 cup butter, cubed 1 1/2 teaspoons ground cinnamon Directions Preheat oven to 400 degree...