These lemon pistachio cheesecake crumb bars feature a creamy lemon filling layered between a buttery oat pistachio crust and a crisp crumble topping. A bright, rich dessert that’s easy to make and perfect for slicing and sharing.
Preheat oven to 350°F (175°C). Grease a 9"x 13"x 2" baking pan and line with parchment paper to create a sling.
Combine the flour, oats, sugar, salt, and lemon zest. Add the butter, and mix with a pastry blender, a fork, or your fingers until the mixture is thoroughly combined. The mixture should form crumbs and hold together when pinched.
Mix in the pistachios.
Reserve about 1 cup of the mixture for the crumb topping.
Transfer the remaining mixture to the prepared pan. Press firmly into an even layer in the bottom of the pan.
Bake 15 minutes. Set aside to cool slightly.
To make the filling:
Using an electric mixer on medium speed, beat the cream cheese, sugar, eggs, and lemon juice. Mix just until smooth and combined.
Pour the filling over the partially baked crust, and spread evenly.
Sprinkle the reserved crumb topping over the top of the filling.
Bake 40 to 45 minutes. The edges should be lightly browned and the center just set (it may still have a slight jiggle).
Cool in the pan on a wire rack for about 20 minutes. Then cover and refrigerate until fully chilled and set (at least 2 hours) before serving.
For clean slices, chill thoroughly and cut with a sharp knife, wiping between cuts.
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Notes
Lemon flavor: Adjust the amount of lemon juice to suit your taste. For a more pronounced lemon flavor, use the full amount and don’t skip the zest.
Pistachios: Roasted pistachios will give you the best flavor. If using salted pistachios, you may want to slightly reduce the added salt in the crumb mixture.
Doneness: The center should still have a slight jiggle when you remove the bars from the oven. They will continue to set as they cool and chill.
Slicing: For clean slices, chill the bars thoroughly and use a sharp knife, wiping it clean between cuts if needed.
Storage: Keep tightly covered in the refrigerator for 4-5 days.