These bars combine a buttery shortbread crust, a sweet-tart mixed berry filling, a creamy cheesecake layer, and a crumbly topping. They are an easy, crowd-pleasing dessert that looks impressive but comes together simply with common ingredients.
Use cold butter for the crust. Do not skip the cornstarch in the berry filling. Let bars cool completely before cutting to prevent a messy slice. Frozen berries can be used without thawing. Store covered in refrigerator for 4-5 days or freeze for up to 3 months.