113g (1/2 cup) unsalted butter, at room temperature
240g (1½ cups) powdered sugar
⅛ cup blueberry puree (made from ¼ cup of fresh or frozen blueberries)
½ teaspoon vanilla
Instructions
In the large bowl of an electric mixer, beat butter on high speed for several minutes until light and creamy
Scrape the sides of the bowl and add powdered sugar; beat on high speed until combined
Scrape the sides of the bowl and add blueberry puree, vanilla and salt; mix on medium speed for one minute; beat on high speed for at least five minutes and until frosting is light and creamy; if it appears too thick, continue to beat for another couple of minutes or until it reaches desired consistency
Recipe by Keep It Sweet Desserts at https://www.keepitsweetdesserts.com/blueberry-buttercream-cups/