Lemon Oatmeal Crumble Bars
If you’re after a dessert that’s both effortlessly simple and wildly satisfying, these Lemon Oatmeal Crumble Bars are calling your name!
With just a handful of pantry staples, you can whip up a buttery oatmeal crust, top it with a creamy lemon filling, and finish it with a crispy crumble that takes it over the top.
They’re the perfect sweet treat when you want something deliciously bright and easy to make.
You’ll be hooked after the first bite!
For the Crust & Topping:
- Unsalted Butter – Softened to room temperature (7 tablespoons). This helps create a rich and buttery texture for the crust and topping.
- Brown Sugar – (3/4 cup) Adds sweetness and moisture to the crust, balancing out the tangy lemon filling.
- Vanilla Extract – (1 teaspoon) Provides a warm, aromatic flavor to the dough.
- All-Purpose Flour – (1 cup) Forms the base for the crumble mixture and adds structure.
- Baking Powder – (1 teaspoon) Helps the crust and topping rise slightly as it bakes.
- Salt – (1/4 teaspoon) Balances the sweetness and enhances the overall flavor.
- Old-Fashioned Oats – (1 cup) Adds texture and chewiness to the crust and topping.
For the Lemon Filling:
- Sweetened Condensed Milk – (1 can, 14 ounces) The key ingredient that gives the lemon filling its creamy, thick texture.
- Lemon Juice – (6 tablespoons) Provides the fresh, tangy flavor that makes this dessert so refreshing.
- Lemon Zest – (1 tablespoon) Enhances the lemon flavor with a burst of citrusy aroma.
Lemon Oatmeal Crumble Bars
Ingredients
For the Crust & Topping:
- 7 tablespoons (99g) unsalted butter, softened to room temperature
- 3/4 cup (150g) light or dark brown sugar, packed
- 1 teaspoon vanilla extract
- 1 cup (125g) all-purpose flour (spooned & leveled)
- 1 teaspoon baking powder
- 1/4 teaspoon salt
- 1 cup (85g) old-fashioned oats or quick oats (not instant)
For the Lemon Filling:
- 1 can (14 ounces) full-fat sweetened condensed milk
- 6 tablespoons (90ml) lemon juice (from about 2 lemons)
- 1 tablespoon lemon zest (from about 1 lemon)
Instructions:
- Prepare the oven and pan: Preheat the oven to 350°F (177°C). Line an 8-inch square baking pan with parchment paper for easy removal of the bars.
- Make the crust and topping:
- Using a handheld or stand mixer with the paddle attachment, beat the softened butter and brown sugar on medium-high speed until fully combined (about 1 minute).
- Scrape down the sides of the bowl, then add the vanilla extract. Beat again on medium-high for 30 seconds until incorporated.
- Add the flour, baking powder, salt, and oats. Mix on medium speed until combined. The mixture should be crumbly and dry, forming between 3–3.5 cups of mixture in total.
- Form the crust:
- Press slightly more than half of the crumble mixture into the bottom of the prepared pan to form the crust. (You want slightly more for the crust than for the topping.)
- Bake for 12 minutes, then remove from the oven.
- Make the lemon filling:
- In a medium bowl, whisk together the sweetened condensed milk, lemon juice, and lemon zest until smooth and thick.
- Assemble the bars:
- Pour the lemon filling over the pre-baked crust while it’s still hot, and spread it evenly.
- Sprinkle the remaining crumble mixture on top of the lemon filling.
- Bake:
- Return the bars to the oven and bake for an additional 22–25 minutes or until the edges are lightly golden and the center is set. Be careful not to over-bake.
- Cool and cut:
- Once done, remove from the oven and let the pan cool completely on a wire rack.
- Once cooled, use the parchment paper to lift the bars out of the pan. Slice into squares.
- Storage:
- Store the leftover bars at room temperature for up to 2 days or refrigerate for up to 1 week.
Freezing Instructions:
- To freeze, place cut bars in a single layer, separated by parchment paper, in a freezer-safe container. They will keep for up to 3 months. To enjoy, thaw overnight in the refrigerator and bring to room temperature before serving.
- Sweetened Condensed Milk: Make sure you’re using full-fat sweetened condensed milk (not evaporated milk) for the filling to set properly. Fat-free versions won’t work.
- Doubling the Recipe: You can easily double the recipe. Simply double all the ingredients and bake in a 9x13-inch pan. Increase the crust pre-bake time to 18 minutes, and bake the filled bars for 35 minutes, or until set.
Calories: 210 kcal | Carbohydrates: 32.3 g | Protein: 3.7 g | Fat: 7.7 g | Saturated Fat: 3.8 g | Cholesterol: 31 mg | Sodium: 133 mg | Potassium: 135 mg | Fiber: 2.4 g | Sugar: 18.1 g | Vitamin A: 145 IU | Vitamin C: 6 mg | Calcium: 23 mg | Iron: 0.6 mg
- Can I use quick oats instead of old-fashioned rolled oats?
If you’re in a pinch, you can use quick oats, but old-fashioned rolled oats are best for that perfect chewy texture. Quick oats might make the bars a bit softer, but they’ll still taste great!
- Can I make the crust and topping in advance?
Yes, you can! Prepare the crust and topping the day before and store them in an airtight container at room temperature. When you’re ready to bake, just press the crust into the pan and proceed with the recipe.
- Can I substitute the sweetened condensed milk with something else?
Sweetened condensed milk is essential for the creamy lemon filling, and unfortunately, there’s no great substitute. If you’re looking for a lower-calorie alternative, you can try evaporated milk with a bit of sugar, but the texture will be a little different.
- How do I keep the bars from sticking to the pan?
Simple! Line the pan with parchment paper and leave an overhang. This will make it super easy to lift the bars out after they’ve cooled and help prevent any sticking.
- Can I freeze these bars?
Absolutely! You can freeze these lemony treats for up to 3 months. Just make sure they’re cooled completely, then store them in a freezer-safe container with parchment paper between layers. Thaw them overnight in the fridge, and they’ll taste as good as new!
