Name: Lemon Crumb Bars
Prep time: 20 min
Cook time: 40 min
Total time: 1 h 55 min
Cuisine: American
Ingredients: 1 cup quick-cooking oats; 1 1/2 cups all-purpose flour; 1 cup light brown sugar, packed; 1/4 teaspoon baking soda; 1/4 teaspoon baking powder; 3/4 cup unsalted butter, melted; 1 can sweetened condensed milk; 1/2 cup freshly squeezed lemon juice; 2 large egg yolks; 1 teaspoon lemon zest; 1/8 teaspoon kosher salt

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These Lemon Crumb Bars combine a buttery oat crumble crust with a bright, creamy lemon filling and a golden crumb topping. I love how the sweet and tangy flavors balance perfectly in every bite. The refreshing citrus filling paired with the crisp crumble texture creates a dessert that feels both comforting and light, making it ideal for any occasion.

Ingredients

(Tip: You'll find the full list of ingredients and measurements in the recipe card below.)

1 cup quick-cooking oats

1 ½ cups all-purpose flour

1 cup light brown sugar, packed

¼ teaspoon baking soda

¼ teaspoon baking powder

¾ cup unsalted butter, melted

1 can sweetened condensed milk

½ cup freshly squeezed lemon juice

2 large egg yolks

1 teaspoon lemon zest

⅛ teaspoon kosher salt

Directions

I preheat the oven to 350°F (175°C) and line a 9x9-inch baking pan with parchment paper.

In a large bowl, I combine the oats, flour, brown sugar, baking powder, and baking soda.

I pour in the melted butter and mix until the mixture becomes crumbly and evenly combined.

I measure out about 2 cups of the crumble mixture and set it aside for the topping.

I firmly press the remaining mixture into the bottom of the prepared baking pan.

I bake the crust for 12 to 15 minutes until lightly golden, then remove it from the oven and let it cool slightly.

In a separate bowl, I whisk together the sweetened condensed milk, lemon juice, egg yolks, lemon zest, and salt until smooth.

I pour the lemon filling evenly over the baked crust.

I sprinkle the reserved crumb mixture evenly across the top.

I bake for 20 to 25 minutes until the edges are golden and the center is set.

I allow the bars to cool completely, then refrigerate them for at least 1 hour before slicing and serving.

Servings and timing

Servings: 9 bars

Prep Time: 20 minutes

Cooking Time: 40 minutes

Chilling Time: 55 minutes

Total Time: 1 hour 55 minutes

Calories: Approximately 320 kcal per serving

Variations

I sometimes add extra lemon zest for a stronger citrus flavor.

I like mixing a handful of shredded coconut into the crumb topping for added texture.

I occasionally substitute lime juice and lime zest for a different citrus twist.

I enjoy adding white chocolate chips to the crumble mixture for extra sweetness.

I sometimes sprinkle powdered sugar over the cooled bars before serving for an elegant finish.

Storage/Reheating

I store these Lemon Crumb Bars in an airtight container in the refrigerator for up to 5 days. For longer storage, I freeze individual bars for up to 3 months and thaw them overnight in the refrigerator before serving. Since these bars are best enjoyed chilled, I usually do not reheat them, but I can let them sit at room temperature for a few minutes before serving if I prefer a softer texture.

FAQs

Can I use bottled lemon juice instead of fresh lemon juice?

I can use bottled lemon juice if needed, but I find that freshly squeezed lemon juice provides the brightest and most natural flavor.

Why do my bars need to chill before slicing?

I refrigerate the bars because chilling helps the filling firm up, making it easier to achieve clean, neat slices.

Can I make these bars ahead of time?

Yes, I often prepare them a day in advance since the flavor and texture improve after chilling overnight.

Can I use old-fashioned oats instead of quick-cooking oats?

I can use old-fashioned oats, but the crumble topping may have a slightly heartier texture.

How do I know when the bars are finished baking?

I look for lightly golden edges and a filling that appears set rather than liquid in the center.

Conclusion

I love making these Lemon Crumb Bars because they offer the perfect combination of buttery crumble and bright citrus flavor. The creamy lemon filling, crisp topping, and refreshing taste make them an excellent dessert for holidays, summer gatherings, or everyday treats. Once chilled and sliced, these bars deliver a delightful balance of sweet and tangy flavors that I always enjoy sharing with family and friends.

📖 Recipe:

Lemon Crumb Bars

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Author: Cheryl
Total Time: 1 hour 55 minutes
Yield: 9 bars
Diet: Vegetarian

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Description

These Lemon Crumb Bars feature a buttery oat crumble crust and topping layered with a creamy, tangy lemon filling. The balance of sweet and citrus flavors makes them a refreshing dessert for any occasion.

Instructions

Preheat the oven to 350°F (175°C) and line a 9x9-inch baking pan with parchment paper.
In a large bowl, combine the oats, flour, brown sugar, baking powder, and baking soda.
Add the melted butter and mix until the mixture becomes crumbly and evenly combined.
Reserve about 2 cups of the crumble mixture for the topping.
Press the remaining crumble mixture firmly into the bottom of the prepared pan.
Bake the crust for 12 to 15 minutes until lightly golden. Remove from the oven and let cool slightly.
In a separate bowl, whisk together the sweetened condensed milk, lemon juice, egg yolks, lemon zest, and salt until smooth.
Pour the lemon filling evenly over the baked crust.
Sprinkle the reserved crumble mixture evenly over the filling.
Bake for 20 to 25 minutes until the edges are golden and the center is set.
Cool completely, then refrigerate for at least 55 minutes before slicing and serving.