Tall, Bold, and Worth the Wait

I used to love a thin lemon bar until I baked one with a filling nearly an inch tall. Learn more about DanyRecipes and why I never went back. Thick is the only way now.

Why Thick Lemon Bars Are Worth It

This lemon bars recipe stacks a generous layer of silky filling over a sturdy shortbread base, so every bite is mostly custard. The extra eggs and juice give you real height and a deep, bright lemon flavor.

These lemon bars from scratch bake in a standard 9×13 pan with a bigger filling and a lower oven for the second bake, which keeps the top smooth and the center creamy. Among my favorite lemon desserts, these look the most impressive, and they pair well with my chewy thumbprint lemon curd cookies on a dessert table.

Ingredients for Tall, Thick Bars

For the crust:

• 2 1/4 cups all purpose flour
• 1/2 cup powdered sugar, plus extra for dusting
• 2 tablespoons cornstarch, for a tender bite
• 1/2 teaspoon fine salt
• 1 cup (2 sticks) cold unsalted butter, cubed

For the thick lemon filling:

• 2 1/2 cups granulated sugar
• 7 large eggs, at room temperature
• 1 cup fresh lemon juice (about 6 large lemons), strained
• 2 tablespoons lemon zest, finely grated
• 1/2 cup all purpose flour, sifted
• 1/2 teaspoon fine salt

Build Your Tall Lemon Layer

STEP 1

Heat the oven to 350°F and line a 9×13 pan with parchment, leaving a tall overhang on the long sides so the thick slab lifts out easily.

STEP 2

Whisk the flour, powdered sugar, cornstarch, and salt, then cut in the cold butter until the mixture forms soft, damp crumbs.

STEP 3

Press the dough firmly into an even layer and bake for 20 minutes until pale golden, then lower the oven to 325°F.

STEP 4

Whisk the sugar, eggs, lemon juice, zest, flour, and salt until completely smooth, then strain it for a silky finish.

STEP 5

Pour the filling over the warm crust and bake for 35 to 40 minutes until the edges are set and the center has just a slight wobble.

STEP 6

Cool on a rack for 45 minutes, chill for at least 4 hours, then lift out, dust with powdered sugar, and slice into squares.

Serving Ideas and Easy Twists

• Cut into generous squares and serve with fresh raspberries on the side.
• Add a spoonful of lightly sweetened whipped cream for a cool, creamy contrast.
• Serve with my crispy shortbread lemon curd cookies for a buttery crunch beside the soft, tall bars.
• Stir a teaspoon of vanilla into the filling for a rounder, bakery style flavor.
• Cut into smaller squares for parties, since thick bars are rich and satisfying.

Pro Tips

• Bake at 325°F after the crust so the thick filling sets gently without cracking.
• Strain the filling to remove bubbles and bits for a smooth, glassy top.
• Give the bars a full 4 hours in the fridge, since thick bars need extra time to set.
• Tent the pan loosely with foil if the top starts to brown before the center sets.
• Use a long, sharp knife and wipe it clean between cuts for tidy edges.
• Dust with powdered sugar only right before serving so it stays snowy white.

Perfect Thick Lemon Bars

These perfect thick lemon bars feature a generous, silky lemon filling layered over a tender, buttery shortbread crust. Made from scratch with fresh lemon juice, lemon zest, and simple pantry ingredients, they bake up tall and creamy with a bright citrus flavor. Perfect for parties, gatherings, and make-ahead desserts.

Print Recipe Pin Recipe

Prep Time 20 minutes mins

Cook Time 1 hour hr

Cooling and Chilling Time 4 hours hrs 25 minutes mins

Total Time 5 hours hrs 45 minutes mins

Servings: 24 bars

Course: Dessert

Cuisine: American

Calories: 260

Ingredients Equipment Method Notes

Ingredients

  

Shortbread Crust

• 2 1/4 cups all-purpose flour
• 1/2 cup powdered sugar plus extra for dusting
• 2 tbsp cornstarch for a tender bite
• 1/2 tsp fine salt
• 1 cup unsalted butter 2 sticks, cold and cubed

Thick Lemon Filling

• 2 1/2 cups granulated sugar
• 7 large eggs at room temperature
• 1 cup fresh lemon juice about 6 large lemons, strained
• 2 tbsp lemon zest finely grated
• 1/2 cup all-purpose flour sifted
• 1/2 tsp fine salt

Equipment

• 9×13-inch Baking Pan
• Parchment paper
• Mixing bowls
• Whisk
• Pastry Cutter
• Fine-Mesh Strainer
• Measuring Cups and Spoons
• Cooling Rack
• Sharp Knife

Method

 

1. Preheat the oven to 350°F (175°C). Line a 9×13-inch baking pan with parchment paper, leaving a tall overhang on the long sides to make lifting the thick bars easier.
2. In a mixing bowl, whisk together the flour, powdered sugar, cornstarch, and salt. Add the cold cubed butter and cut it into the dry ingredients until the mixture forms soft, damp crumbs.
3. Press the crust mixture firmly and evenly into the prepared baking pan. Bake for 20 minutes, until lightly golden. Remove from the oven and reduce the oven temperature to 325°F (165°C).
4. In a separate bowl, whisk together the granulated sugar, eggs, fresh lemon juice, lemon zest, sifted flour, and salt until completely smooth. Strain the mixture through a fine mesh strainer for a silky filling.
5. Pour the lemon filling evenly over the warm crust. Bake at 325°F (165°C) for 35 to 40 minutes, until the edges are set and the center has a slight wobble.
6. Transfer the pan to a cooling rack and let the bars cool for 45 minutes. Refrigerate for at least 4 hours until completely chilled and firm. Lift the bars out using the parchment overhang, dust with powdered sugar, and slice into squares with a sharp knife.

Notes

For the tallest, creamiest lemon bars, use a standard 9×13-inch pan and follow the lower 325°F baking temperature for the filling. Strain the lemon mixture before baking to remove bubbles and create a smooth finish. If the top begins browning too quickly, loosely tent the pan with foil.

Allow the bars to chill for at least 4 hours before slicing. For the best results, prepare them a day ahead and refrigerate overnight. Use a long, sharp knife and wipe it clean between cuts for neat squares. Dust with powdered sugar just before serving.

Serve with fresh raspberries, lightly sweetened whipped cream, or lemon cookies. Store covered in the refrigerator for up to 5 days. Freeze undusted bars, tightly wrapped, for up to 2 months.

FAQs

Why are these bars thicker than regular lemon bars?
The recipe uses more eggs, juice, and sugar in the same 9×13 pan, so the filling bakes up tall. A lower oven temperature keeps that extra filling smooth instead of cracked.

How do I know the thick filling is done?
The edges should be firm and the center should wobble slightly when you nudge the pan. It will finish setting as it cools and chills.

Can I make them ahead?
Yes, bake them a full day ahead and keep them chilled. Thick bars slice best after a long, cold rest.

How should I store leftovers?
Cover and refrigerate for up to 5 days, with parchment between layers. Freeze undusted bars wrapped tightly for up to 2 months.

Why did my filling crack on top?
The oven was likely too hot or the bars were overbaked. Lower the temperature, pull the pan while the center still wobbles, and cool it gradually.

Tall Bars, Tall Compliments

A thick lemon bar feels like a small luxury, with a crisp base and a tangy, creamy center in every bite. I hope this one becomes your new favorite. For more citrus treats, try my melt in your mouth lemon curd cookies, the 5 ingredient glazed lemon curd cookies, or the zesty drop lemon curd cookies.

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