Lemon Crumb Bars

Lemon Crumb Bars became my go-to bake when I wanted something bright and sweet that reminded me of sunshine even on gloomy days and the first time I made them I was surprised by how something so simple could deliver such a bold zesty flavor layered with buttery crumbs that melt in your mouth.

I especially love how the tart lemon filling contrasts with the rich crumble and the fact that they slice so neatly makes them perfect for potlucks picnics or quiet afternoon treats with tea and once you try a batch it’s hard to stop at just one square.

Ingredients

Here’s what I use for this recipe. You can always make substitutions if you prefer!

• All-purpose flour – Forms the base of both the crust and crumble for structure and softness.
• Old-fashioned oats – Adds texture and a rustic touch to the crumble topping.
• Granulated sugar – Sweetens both the crust and the lemon filling.
• Brown sugar – Brings a deeper caramel note to the crumb topping.
• Butter – Binds the dry ingredients together and adds richness throughout.
• Lemons – Provide both zest and juice for that tart citrusy flavor.
• Sweetened condensed milk – Creates a creamy luscious lemon layer that’s silky smooth.
• Salt – Balances all the sweetness and sharpness from the lemon.
• Vanilla extract – Adds warmth to the crumb mixture and pairs well with lemon.
• Tools You’ll Need
• Mixing bowls – For preparing the crumb mixture and lemon filling.
• Measuring cups and spoons – For accuracy in both the crust and filling.
• Zester and juicer – To extract every bit of lemon flavor.
• 9×9-inch baking pan – The perfect size for thick, satisfying bars.
• Parchment paper – Makes lifting and slicing the bars clean and easy.
• Spatula – For pressing the crust and spreading the filling evenly.

Instructions

Step 1: Prep the Pan and Oven

I preheat the oven to 350°F and line a 9×9-inch baking pan with parchment paper letting it hang over the sides so the bars can be lifted out easily later.

Step 2: Make the Crumb Mixture

In a large bowl I mix the flour oats granulated sugar brown sugar and salt then I add melted butter and vanilla extract stirring until it forms a crumbly texture that holds together when pinched.

Step 3: Press and Bake the Crust

I reserve about 1 cup of the crumb mixture for topping then I press the rest firmly into the bottom of the prepared pan and bake it for 10–12 minutes until lightly golden.

Step 4: Prepare the Lemon Filling

While the crust is baking I whisk together the sweetened condensed milk fresh lemon juice and lemon zest until smooth and creamy.

Step 5: Layer and Top

I pour the lemon filling over the warm crust and spread it evenly then I sprinkle the reserved crumb mixture over the top gently pressing it in.

Step 6: Bake Again

I return the pan to the oven and bake for 20–25 minutes until the top is golden and the center is just set then I let it cool completely before chilling for at least 2 hours.

Step 7: Slice and Serve

Once chilled I lift the bars out using the parchment overhang and slice them into neat squares then dust them with powdered sugar just before serving.

Tips

For extra lemon flavor I sometimes add a little lemon extract to the filling and if you prefer a firmer bar chill them overnight before slicing. These also freeze beautifully—just wrap individual bars and thaw when ready to enjoy. For a touch of elegance I like to garnish them with a thin lemon slice or a sprinkle of zest.

Ways to Serve

With a cup of hot tea or iced herbal lemonade

As a picnic dessert packed in a tin

On a dessert platter with other fruit bars

Topped with whipped cream or a dollop of Greek yogurt

Frequently Asked Questions

Can I use bottled lemon juice in Lemon Crumb Bars?

Fresh lemon juice is best for flavor but bottled works in a pinch if it’s 100% pure.

Can I make Lemon Crumb Bars gluten-free?

Yes use a 1:1 gluten-free flour blend and certified GF oats.

How long do Lemon Crumb Bars last?

They keep in the fridge for up to 5 days and can also be frozen for longer storage.

See You in the Kitchen

I hope you try these Lemon Crumb Bars and find them as refreshing and comforting as I do whether you’re baking for a gathering or just craving a citrusy treat they always deliver a little sunshine in every bite.

Happy Cooking!

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