The best blueberry muffins are moist and fluffy, full of fresh, juicy berries and finished with a buttery brown sugar streusel crumb topping. These bake shop Blueberry Streusel Muffins are big, decadent, and totally satisfying. Whip up 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 freezer-friendly, too!