Blueberry Rhubarb Muffins

Sweet blueberries and tart chunks of rhubarb baked into tender muffins, fragrant with the scent of cinnamon, trumpet the arrival of spring. Because it grows in cooler climates, rhubarb is a popular fruit in Scandinavia. When fresh rhubarb is out of season, you can use frozen rhubarb in this recipe. Don’t thaw before adding it, but increase the baking time slightly.