The best bakery-style blueberry muffins are moist and fluffy, bursting with fresh, juicy berries, and finished with a crunchy sugar topping. These sour cream blueberry muffins are also big, decadent, and totally satisfying! Stir together a batch for a convenient grab-and-go breakfast, a lovely addition to a brunch buffet, or a sweet make-ahead afternoon snack. They're so easy, and freezer-friendly, too!