In large bowl, beat milk, applesauce, oil, vanilla and egg until well blended. Stir in 2 cups flour, the granulated sugar, baking powder and salt all at once just until flour is moistened (batter will be lumpy). Gently stir in blueberries. Divide batter evenly among muffin cups. Sprinkle each with about 2 teaspoons streusel topping.