Lemon Oatmeal Crumble Bars are the kind of sunny treat that always brings warmth to any kitchen. These Lemon Oatmeal Crumble Bars blend zesty lemon filling with a comforting oat crust, creating a dessert that feels both fresh and nostalgic. Perfect for spring gatherings, afternoon snacks, or gifting.

Why You Will Love This Recipe: Lemon Oatmeal Crumble Bars

• Bright lemon flavor with a buttery, toasty oat crumble
• Easy to prepare with simple pantry ingredients
• Perfect balance of tart and sweet
• Great for meal prep and freezer friendly

Ingredients Needed for This Recipe

• 1 cup all purpose flour
• 1 cup old fashioned oats
• 1 cup granulated sugar, divided
• 1 cup brown sugar
• 1 teaspoon baking powder
• 1 teaspoon vanilla extract
• 1 cup butter, melted
• 3 large eggs
• 1 tablespoon lemon zest
• 1 third cup lemon juice
• 2 tablespoons cornstarch
• Pinch of salt

How to Make Lemon Oatmeal Crumble Bars

Preheat oven to 350 F. Line an 8 by 8 baking pan with parchment.
In a bowl, mix oats, flour, brown sugar, baking powder, and salt.
Stir in melted butter and vanilla until crumbly.
Press two thirds of the mixture into the prepared pan.
In another bowl, whisk eggs, lemon juice, lemon zest, cornstarch, and remaining sugar.
Pour lemon filling over the crust.
Sprinkle the remaining crumble mixture on top.
Bake 28 to 32 minutes or until golden.
Cool completely before slicing.

How to Serve Lemon Oatmeal Crumble Bars

• Serve chilled for a firm bar or slightly warm for a softer texture
• Pair with tea, coffee, or fresh berries
• Dust with powdered sugar for extra charm

How to Store Lemon Oatmeal Crumble Bars

• Refrigerate in an airtight container up to 5 days
• Freeze up to 2 months wrapped tightly
• Thaw in the fridge overnight

Tips to Make Lemon Oatmeal Crumble Bars

• Fresh lemon juice gives best flavor
• Do not skip the cornstarch, it thickens the filling
• Press crust firmly to avoid crumbling

Helpful Notes for This Recipe

• You can use half whole wheat flour
• Adjust sweetness by reducing sugar slightly if preferred

Variation

• Add blueberries for blueberry lemon bars
• Use lime or orange for citrus twists

FAQs

Can I use quick oats?
Yes, but texture will be softer. Old fashioned oats work best.

Can I make this gluten free?
Use a gluten free flour blend and certified GF oats.

Can I double the recipe?
Yes. Bake in a 9 by 13 pan and increase bake time slightly.

Conclusion

These bars are citrus perfection and so simple to bake. We hope you try these bright and cozy Lemon Oatmeal Crumble Bars soon. They are always a crowd favorite.

Lemon Oatmeal Crumble Bars

Author: Nonna Lucia Bianchi
Total Time: 45 minutes
Yield: 12 bars 1x

Print Recipe

Description

Bright and zesty lemon bars with a buttery oat crumble.

Ingredients

Scale

1 cup all purpose flour

1 cup old fashioned oats

1 cup granulated sugar

1 cup brown sugar

1 teaspoon baking powder

1 teaspoon vanilla extract

1 cup butter melted

3 large eggs

1 tablespoon lemon zest

1 third cup lemon juice

2 tablespoons cornstarch

Pinch of salt

Instructions

1. Preheat oven to 350 F and prepare pan.

2. Mix dry ingredients with melted butter.

3. Press two thirds into baking pan.

4. Whisk filling ingredients together.

5. Pour filling over crust.

6. Add remaining crumble.

7. Bake until golden.

8. Cool and slice.

Notes

Fresh lemon juice recommended

Bars slice best when fully chilled

Prep Time: 15 minutes
Cook Time: 30 minutes
Category: Dessert
Method: Baking
Cuisine: American

Nutrition

Serving Size: 1 bar
Calories: 210
Sugar: 22
Sodium: 90
Fat: 8
Saturated Fat: 4
Unsaturated Fat: 2
Trans Fat: 0
Carbohydrates: 32
Fiber: 2
Protein: 3
Cholesterol: 40

Keywords: lemon bars, oatmeal bars, lemon oatmeal crumble bars

Author
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Lucia Bianchi

Lucia Bianchi is the heart of authentic Italian pizza. With decades of experience, she masters both classic and gourmet pizzas, bringing rich heritage and elegant flavors straight from Italy’s kitchen to your plate. Her passion for tradition and culinary creativity ensures every pizza is a delicious journey into Italy’s finest flavors.