These Healthy Whole Wheat Sourdough Discard Blueberry Streusel Muffins deliver all the tender, buttery comfort of a classic bakery treat at only 172 calories per muffin and with zero refined sugars! rafted with nutritious fresh-milled hard white wheat flour (or any whole wheat flour you have on hand), tangy sourdough discard, and protein-rich Greek yogurt, these muffins bake up remarkably soft and moist on the inside.