Easy Lemon Crumb Bars (From Scratch)
These Easy Lemon Crumb Bars have a buttery oat shortbread crust, a creamy fresh lemon filling made with sweetened condensed milk, and a rich crumb topping that bakes up golden and crisp. They're the ultimate easy lemon dessert for spring and summer - perfect for Easter, Mother's Day, BBQs, potlucks, or anytime you're craving something bright and refreshing.
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If you love classic lemon bars but want something with more texture and a little extra crunch on top, this recipe is for you. Unlike traditional lemon squares, these have an added crumb layer that gives you the perfect balance of creamy, buttery, and crumbly in every bite. Simple ingredients. No box mix. Big citrus flavor.
Why You'll Love These Easy Lemon Crumb Bars
Bright, fresh lemon flavor - Made with freshly squeezed lemon juice and real lemon zest.
Buttery oat crumb topping - Crisp, golden, and slightly chewy from the oats.
Completely from scratch - Simple pantry staples only.
Easy to make - No complicated steps.
Make-ahead friendly - Even better after chilling.
Perfect texture - Crunchy crust, silky lemon center, crumbly top.
Ingredients
For the Crust & Crumb Topping
All-purpose flour
Quick oats or old-fashioned oats
Light brown sugar
Granulated sugar
Baking powder
Salt
Unsalted butter
For the Lemon Filling
Sweetened condensed milk
Large egg yolk
Freshly squeezed lemon juice
Lemon zest
How to Make Easy Lemon Crumb Bars (Step-by-Step)
1. Prep the Pan and Oven
Preheat your oven to 350°F (175°C).
Line a 9x9-inch baking pan with parchment paper, leaving overhang on the sides for easy removal later.
2. Make the Crust and Crumb Mixture
In a large bowl, combine flour, oats, brown sugar, granulated sugar, baking powder, and salt.
Pour in the melted butter and mix with a fork until the mixture becomes crumbly. The texture should be loose and slightly moist but crumble easily between your fingers.
Set aside about 1 cup of this mixture - that will be your crumb topping.
3. Pre-Bake the Crust
Press the remaining mixture firmly and evenly into the prepared pan.
Bake for 12-14 minutes, until lightly golden.
Remove from the oven but keep the oven on.
4. Make the Lemon Filling
In a bowl, whisk together egg yolk, sweetened condensed milk, fresh lemon juice, and lemon zest.
Whisk until smooth and creamy. You'll notice the mixture naturally thickens - that's the lemon juice reacting with the condensed milk, and it's completely normal.
5. Add Filling and Crumb Topping
Pour the lemon filling over the warm crust.
Evenly sprinkle the reserved crumb mixture over the top.
6. Bake Again
Return to the oven and bake for 22-25 minutes, until the edges are set. The center should still be slightly soft - it will firm up as it cools.
7. Cool Completely (Very Important!)
Let the bars cool completely at room temperature.
Then refrigerate for at least 3 hours (preferably 4 hours or overnight). This step ensures clean slices and fully set lemon filling.
8. Slice and Serve
Lift the bars out using the parchment paper.
Cut with a sharp knife, wiping the blade clean between slices for neat edges.
Optional: Dust with powdered sugar just before serving.
Tips for Perfect Easy Lemon Crumb Bars
- Use freshly squeezed lemon juice. Bottled juice doesn't have the same brightness and fresh flavor.
- Don't skip the zest. The zest contains the most intense lemon flavor. Grate only the yellow part, not the bitter white pith.
- Line your pan with parchment paper and leave overhang for easy lifting and cleaner cuts.
- Chill before cutting. At least 2-3 hours in the fridge is key for perfect slices.
- Don't overbake. The center should jiggle slightly when you remove it from the oven. It will continue to set as it cools.
Frequently Asked Questions
Yes, but freshly squeezed lemon juice will give you the best flavor.
Store them in an airtight container in the refrigerator for up to 4 days.
Yes. Slice them first, wrap tightly, and freeze for up to 2 months. Thaw overnight in the refrigerator.
Usually because it wasn't baked long enough or the bars were cut before fully cooling and chilling
Absolutely. A light dusting gives them that classic lemon bar finish.
Looking for the perfect THE EASIEST LEMON BARS recipe? These homemade lemon bars with a buttery shortbread crust and tangy lemon filling are the ultimate lemon dessert. They're simple to make, beautifully balanced between sweet and tart, and perfect for holidays, gatherings, or a cozy weekend bake.
Once you make them, you'll keep coming back to this lemon bars recipe again and again.
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Easy Lemon Crumb Bars
These Easy Lemon Crumb Bars have a buttery oat shortbread crust, a creamy fresh lemon filling made with sweetened condensed milk, and a rich crumb topping that bakes up golden and crisp. They're the ultimate easy lemon dessert for spring and summer - perfect for Easter, Mother's Day, BBQs, potlucks, or anytime you're craving something bright and refreshing.
Ingredients
OAT CRUST & TOPPING
- 1 ½ cups (180g) all purpose flour
- 1 cup (80g) quick oats or old fashioned oats
- ¾ cup (150g) light brown sugar
- 2 tablespoon (25g) granulated sugar
- 1 teaspoon baking powder
- ¼ teaspoon salt
- 1 ½ sticks (170g) unsalted butter, melted
LEMON FILLING
- 1 (14 ounces weigh) can full-fat sweetened condensed milk
- ⅓ cup freshly squeezed lemon juice (about 3 medium lemons)
- zest of 1 lemon
- 1 egg yolk
Instructions
- Prep the Pan & Oven
Preheat your oven to 350°F (175°C). Line a 9x9-inch baking pan with parchment paper, leaving a little overhang for easy lifting later. - Make the Crust & Topping
In a large bowl, combine the flour, oats, sugar, baking powder, and salt. Pour in the melted butter and mix with a fork until the mixture becomes crumbly. Don’t overmix — you want a nice crumb texture. Set aside about 1 cup of the mixture for the topping. - Pre-Bake the Crust
Press the remaining mixture firmly into the bottom of the prepared pan. Bake for 12–15 minutes, or until lightly golden. - Make the Lemon Filling
In a bowl, whisk together the egg yolks, sweetened condensed milk, fresh lemon juice, and lemon zest until smooth and creamy. - Assemble
Pour the lemon filling over the warm crust. Sprinkle the reserved crumb mixture evenly over the top. - Bake Again
Bake for 22–25 minutes, or until the edges are set. The center should still be slightly soft — it will firm up as it cools. - Chill & Slice
Let the bars cool completely, then refrigerate for at least 3 hours (or longer). Lift them out using the parchment paper, slice into squares, and dust with powdered sugar if desired.
Notes
- Use freshly squeezed lemon juice. Bottled juice doesn't have the same brightness and fresh flavor.
- Don't skip the zest. The zest contains the most intense lemon flavor. Grate only the yellow part, not the bitter white pith.
- Line your pan with parchment paper and leave overhang for easy lifting and cleaner cuts.
- Chill before cutting. At least 2-3 hours in the fridge is key for perfect slices.
- Don't overbake. The center should jiggle slightly when you remove it from the oven. It will continue to set as it cools.
- Store them in an airtight container in the refrigerator for up to 4 days.
Nutrition Information:
Yield: 12 Serving Size: 1Amount Per Serving: Calories: 290Total Fat: 4gSaturated Fat: 1gUnsaturated Fat: 2gCholesterol: 20mgSodium: 108mgCarbohydrates: 58gFiber: 3gSugar: 20gProtein: 7g
