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Lemon Crumb Bars Recipe

Lemon Crumb Bars Recipe

Make Lemon Crumb Bars Recipe: bake bright lemon custard on a buttery crumb crust for sunny, crowd-pleasing bars.

Prep Time20 minutes
Cook Time40 minutes
Total Time60 minutes
Yield12

Ingredients

Instructions

Step 1: Preheat the oven and prepare the pan

Preheat the oven to 350°F (175°C) and line a 9x13-inch baking pan with a sheet of parchment paper leaving an overhang on two sides for easy removal later. Make sure the parchment sits flat in the pan so the crust presses evenly; set the lined pan on the painted pine wood surface in soft white while you assemble the rest of the components.

Step 2: Combine the dry ingredients for crust and topping

In a medium matte ceramic bowl, whisk together 2 cups all-purpose flour, 1/2 cup granulated sugar, and 1/4 teaspoon salt until evenly distributed and airy. Use a fork or dry whisk to break up any small clumps so the flour mixture feels light and uniform before adding butter.

Step 3: Cut in the cold butter to form coarse crumbs

Add the 3/4 cup cold, cubed unsalted butter to the flour-sugar-salt mixture and use a pastry cutter or fork to cut the butter in until the mix resembles coarse crumbs with some pea-sized pieces remaining—visible irregularity in texture is ideal, showing both flour dust and buttery fragments.

Step 4: Press the crust into the pan

Reserve about one-third of the crumb mixture for the topping, then press the remaining two-thirds firmly and evenly into the bottom of the prepared 9x13 pan to form a compact, even crust layer. Use the base of a measuring cup or a flat spatula to get a smooth, level surface with clean edges.

Step 5: Bake the crust until lightly golden

Slide the pan (set on the painted pine wood surface) into the oven and bake the pressed crust for 15–18 minutes until it develops a faint golden hue and the edges look set. Remove from the oven and leave the pan on the surface while you prepare the filling so the crust stays hot when you pour the filling over it.

Step 6: Mix the dry elements of the lemon filling

While the crust bakes, whisk together 1 cup granulated sugar and 2 tablespoons all-purpose flour in the same medium matte ceramic bowl used earlier, ensuring continuity of tools and textures. This dry mix will help thicken the lemon custard once the eggs and juice are added.

Step 7: Incorporate the eggs into the filling

Add the 3 large eggs to the sugar-flour mixture one at a time, whisking thoroughly after each addition until the batter is smooth and slightly glossy, with no visible streaks of yolk. The mixture should thicken a little and become homogenous before the citrus is introduced.

Step 8: Add lemon juice and zest to complete the filling

Stir in 1/2 cup fresh lemon juice and 1 tablespoon lemon zest until fully combined; the filling should be a bright, pale-yellow, slightly viscous custard with specks of zest suspended throughout.

Step 9: Pour the filling over the hot crust and bake again

Carefully pour the lemon filling evenly over the hot, just-baked crust in the lined 9x13 pan, filling the rectangular pan nearly to the edges, then return the pan to the oven and bake for an additional 20–25 minutes until the filling is set and no longer jiggly in the center.

Step 10: Cool the pan completely on a wire rack

Remove the pan to a wire rack and allow it to cool completely on the painted pine surface; cooling fully will let the lemon layer firm so the bars slice cleanly. Leave the parchment overhang accessible for easy lifting later.

Step 11: Dust with powdered sugar if desired

Once the bars are fully cooled, sift a light, even layer of powdered sugar over the top to add a soft visual contrast and a whisper of extra sweetness—this step is optional but adds a classic finish.

Step 12: Lift, slice, and arrange the bars

Using the parchment overhang, lift the whole slab gently from the pan onto the painted pine surface, then use a sharp knife to cut into evenly sized squares, wiping the blade between cuts for clean edges.

Step 13: Plate and serve with a bright presentation

Arrange the cut lemon crumb bars in a small stack or neat row on a pale green plate with a subtle circular design, showcasing the flaky golden crumb topping, the vibrant thick lemon filling, and the soft cookie-like bottom crust.

Notes