Bright, buttery Lemon Crumb Bars are a tangy, sweet treat with a crumbly shortbread base and lemon curd center. This Lemon Crumb Bars recipe is ideal for picnics, afternoon tea, and dessert platters — learn how to get the perfect set and crumb topping texture. Includes gluten-free suggestions and storage tips. Bake today for a citrusy, crowd-pleasing dessert.