My Lemon Crumb Bars combine everything you love about classic lemon bars with the buttery crunch of a crumb bar. They have a soft, custardy lemon center, a rich vanilla shortbread crust, and a golden crumble topping that makes them feel extra cozy and bakery-style.
These bars are bright, buttery, tangy, and incredibly easy to make with simple ingredients. They slice beautifully, travel well, and are perfect for spring, summer, baby showers, Easter brunches, or anytime you want a dessert that tastes sunny and fresh.
A Quick Look At The Recipe
🍋 Recipe: Lemon Crumb Bars
⏰ Ready In: About 3 hours (including cooling)
🍽️ Serves: 9 bars
🔥 Calories: Approximately 441 calories per bar
🧈 Main Ingredients: Fresh lemon juice, lemon zest, buttery vanilla shortbread crumble
🌱 Dietary Info: Vegetarian
💛 Why You’ll Love It: Bright, tart lemon filling layered between buttery shortbread crust and golden crumble topping
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Why you'll love this recipe
- Bright lemon flavor: Fresh lemon juice and zest give these bars a bold citrus flavor that tastes fresh instead of overly sweet.
- Buttery crumb topping: The vanilla shortbread crumble adds texture and makes these feel more unique than a traditional lemon bar.
- Simple ingredients: Everything comes together with pantry staples and a handful of lemons.
- Easy to slice and serve: Once chilled, these bars cut cleanly and are easy to serve for parties, brunches, or bake sales.
- Perfect balance of textures: You get crisp buttery edges, soft lemon filling, and crumbly golden topping in every bite.
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Ingredients You'll Need
- All-purpose flour: Gives structure to both the shortbread crust and the lemon filling.
- Granulated sugar: Sweetens the crust while balancing the tart lemon flavor in the filling.
- Unsalted butter: Melted butter creates an easy press-in shortbread dough with rich buttery flavor.
- Salt: Balances the sweetness and keeps the bars from tasting flat.
- Vanilla extract: Adds warmth and softness to the shortbread base and crumble topping.
- Large eggs: Help the lemon filling bake into a soft custardy layer.
- Fresh lemon juice: The star ingredient that gives these bars their bright citrus flavor. Fresh juice is essential here.
- Lemon zest: Adds concentrated lemon flavor and makes the filling taste extra fresh and vibrant.
- Confectioner's sugar: Dusted on top adds contrast and a smooth finish to the bars.
See recipe card for quantities.
Easy Substitutions & Variations
- Extra lemony: Add additional lemon zest for a stronger citrus flavor.
- Powdered sugar: Dust the cooled bars with powdered sugar before serving for a classic lemon bar finish.
- Berry version: Add a thin layer of raspberry preserves under the lemon filling for a fruity twist.
- Salted crumble: Sprinkle flaky salt on top after baking for a sweet-salty contrast.
- Gluten-free: Use a 1:1 gluten-free flour blend in place of the all-purpose flour.
How to Make This Recipe
Note: I bake by weight for accuracy. Cup measurements are approximate and may vary depending on how you scoop.
Step 1: Make the shortbread dough: Preheat the oven to 350°F and line an 8x8-inch baking pan with parchment paper. In a large bowl, stir together the melted butter, granulated sugar, vanilla extract, and salt. Add the flour and mix until a soft crumbly dough forms.
Step 2: Press and par-bake the crust: Press about two-thirds of the dough evenly into the bottom of the prepared pan and reserve the remaining dough for the crumble topping. Bake the crust for 12–15 minutes, until lightly golden around the edges.
Step 3: Make and assemble the filling: In a separate bowl, whisk together the eggs, granulated sugar, fresh lemon juice, lemon zest, flour, and salt until smooth. Pour the filling over the warm crust, then crumble the remaining dough evenly over the top without pressing it down.
NOTE: The crumble will mostly sink just below the surface of the custard while baking. This is normal and allows us to decorate it like a classic lemon bar while also having the crumble texture inside.
Step 4: Bake for 23–27 minutes, until the crumble topping is golden and the lemon filling is mostly set with a slight jiggle in the center. You will see air bubbles on the top-- this is totally normal and will be covered by powdered sugar.
Let cool completely before topping with confectioners' sugar and slicing. For extra clean cuts, refrigerate for 30–60 minutes before serving.
Weigh your ingredients! Using a kitchen scale ensures your measurements are accurate, which is key for getting consistent results in baking. It takes the guesswork out of measuring and helps your recipes turn out exactly as intended every time.
Expert Tips
- Use fresh lemon juice: Bottled lemon juice won’t give the same bright, fresh flavor. Fresh lemons make a huge difference here.
- Don’t overbake: The center should still have a slight jiggle when you pull the bars out. They continue setting as they cool.
- Let them cool completely: Warm lemon bars are difficult to slice cleanly. Cooling is essential for the custard layer to fully set.
- Keep the crumble chunky: Larger crumble pieces create better texture and prettier bakery-style bars.
- Chill before slicing: A short fridge chill gives you cleaner edges and neater slices.
What Makes This Recipe Special?
Most lemon bars focus entirely on the custardy lemon layer, but these Lemon Crumb Bars add buttery texture and richness from the shortbread crumble topping. The contrast between tart lemon filling and buttery vanilla crumble makes them feel nostalgic while still tasting a little different from the classic version everyone already knows.
The crumble also softens slightly as the bars chill, giving every bite a mix of buttery crunch and soft lemon filling that feels almost like a cross between lemon bars and lemon coffee cake.
If you try these lemon bars, you absolutely need to give my blueberry crumb bars and my brownie crumb bars a try! They are part of my "Everything's A Crumb Bar" series and they are to die for!
FAQ
Fresh lemon juice is highly recommended for the best flavor. Bottled juice tends to taste muted and slightly artificial.
That’s completely normal. The eggs and flour help the filling set as it bakes.
Yes! These bars actually slice even better after chilling overnight.
Yes. Because of the egg-based lemon filling, they should be stored in the refrigerator.
Yes. Wrap the sliced bars tightly and freeze for up to 2 months.
Troubleshooting Guide
| Problem | Cause | Fix |
|---|---|---|
| Filling seems runny | Bars were underbaked or sliced too early | Let cool fully and chill before slicing |
| Crumble sank into filling | Filling is naturally thin before baking | This is normal and adds texture |
| Crust feels too soft | Crust wasn’t par-baked long enough | Bake until lightly golden before adding filling |
| Bars taste too sweet | Lemons were small or less tart | Add extra lemon zest or a bit more juice next time |
| Bars stick to the pan | No parchment paper used | Always line the pan for easy removal |
Storage
Store Lemon Crumb Bars in an airtight container in the refrigerator for up to 5 days. The bars become even more flavorful after chilling overnight.
For longer storage, freeze the bars tightly wrapped for up to 2 months. Thaw in the refrigerator before serving.
Related
Looking for more of my crumb bar recipes? Try these!
Did you make this recipe?
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Lemon Crumb Bars
Equipment
- Kitchen Scale
- Mixing bowls
- Zester
- 8×8 baking pan
- Parchment Paper
- Fork for mixing
- Whisk for mixing
- Small mesh strainer or sifter for sifting confectioners' sugar
Ingredients
- 240 grams all-purpose flour
- 200 grams granulated sugar
- 170 grams unsalted butter melted
- ½ teaspoons salt
- 1 teaspoons vanilla extract
- 3 large eggs
- 200 grams granulated sugar
- 120 milliliters fresh lemon juice about 3-4 lemons
- 1 tablespoons lemon zest
- 30 grams all-purpose flour
- ¼ teaspoons salt
- confectioners sugar for dusting
Instructions
- Prep: Preheat oven to 350°F. Line an 8x8 pan with parchment paper.
- Make the shortbread dough: In a large bowl, mix melted butter, granulated sugar, vanilla extract, and salt together. Stir in flour until a soft, crumbly dough forms.200 grams granulated sugar, 170 grams unsalted butter, ½ teaspoons salt, 1 teaspoons vanilla extract, 240 grams all-purpose flour
- Press the crust: Press about ⅔ of the shortbread dough firmly and evenly into the bottom of the prepared pan. Set the remaining ⅓ aside for the crumble topping.
- Par-bake the crust: Bake the crust for 12-15 minutes, until just set and very lightly golden at the edges. Remove and let cool for 5 minutes while you make the lemon filling.
- Make the lemon filling: In a bowl, whisk together eggs, granulated sugar, fresh lemon juice, lemon zest, flour, and salt until smooth and fully combined. The mixture will be thin and watery — that's normal.3 large eggs, 200 grams granulated sugar, 120 milliliters fresh lemon juice, 1 tablespoons lemon zest, 30 grams all-purpose flour, ¼ teaspoons salt
- Assemble: Pour the lemon filling evenly over the par-baked crust. Crumble the reserved shortbread dough over the top in rough, uneven chunks — don't press it down.
- Bake: Bake for 23-27 minutes, until the lemon filling is set at the edges with just a slight jiggle in the center. The top will look like a bunch of small air bubbles popped on the surface, but we will cover that with confectioners' sugar next.
- Cool: Let cool completely in the pan — at least 2 hours. The lemon filling needs time to fully set before slicing. Once cool, dust with sifted confectioners sugar. For extra clean cuts, refrigerate for 30-60 minutes before slicing.confectioners sugar
Video
Notes
- Fresh lemon juice only: Bottled lemon juice won't give you that bright, vibrant flavor. You need the real thing here.
- The filling will look very thin: Don't worry — the eggs and flour set it up into a custardy layer as it bakes. Pour slowly and evenly.
- Crumble sinking: Some (or all!) of the crumble will sink slightly into the lemon filling — this is totally normal and actually gives you a nice textural contrast in every bite.
- Powdered sugar: If you want to finish these with a dusting of powdered sugar (very classic lemon bar move), wait until fully cooled and right before serving.
- Storage: Store in an airtight container in the fridge for up to 5 days.
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