These Easy Blueberry Crumble Bars are filled with sweetened plump, juicy vanilla and citrus-hinted blueberries then layered on top of a shortbread crust and topped with a buttery crumble! These are so addictive! What Is a Blueberry Crumble? Crumbles are a cousin to pies but much easier to make. They contain a sweetened filling of blueberries […]