Lemon Oatmeal Crumble Bars
These Lemon Oatmeal Crumble Bars combine a buttery oat crust with a tangy lemon filling, topped with a crunchy oat crumble for the perfect balance of sweet and tart. Easy to make and perfect for a refreshing dessert or snack.
- Author: Nora
- Prep Time: 15 minutes
- Cook Time: 37 minutes
- Total Time: 52 minutes
- Yield: 16 bars 1x
- Category: Dessert, Snack
- Method: Baking
- Cuisine: American
- Diet: Vegetarian
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)
- 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, totaling 3 to 3.5 cups.
- Form the crust: Press slightly more than half of the crumble mixture into the bottom of the prepared pan to form the crust. Bake for 12 minutes, then remove from the oven.
- Make the lemon filling: In a medium bowl, whisk together the full-fat sweetened condensed milk, lemon juice, and lemon zest until smooth and thick.
- Assemble the bars: Pour the lemon filling over the warm crust and spread evenly. Sprinkle the remaining crumble mixture on top.
- Bake: Return the bars to the oven and bake for 22 to 25 minutes, or until the edges are lightly golden and the center is set. Avoid over-baking.
- Cool and cut: Remove from the oven and cool completely on a wire rack. Use the parchment paper to lift the bars out of the pan and slice into squares.
- Storage: Store at room temperature for up to 2 days or refrigerate for up to 1 week. Freeze cut bars in a single layer separated by parchment paper for up to 3 months. Thaw overnight in the refrigerator before serving.
Notes
- Use full-fat sweetened condensed milk for the filling; fat-free versions will not set properly.
- You can double the recipe and bake in a 9×13-inch pan: increase crust pre-bake time to 18 minutes and bake filled bars for 35 minutes or until set.
- Do not over-bake the bars to maintain a soft and chewy center.
- Use parchment paper to easily lift bars out of the pan.
- Old-fashioned oats or quick oats work best; avoid instant oats.
Nutrition
- Serving Size: 1 bar (1/16th of the recipe)
- Calories: 220
- Sugar: 18g
- Sodium: 80mg
- Fat: 9g
- Saturated Fat: 5g
- Unsaturated Fat: 3g
- Trans Fat: 0g
- Carbohydrates: 31g
- Fiber: 2g
- Protein: 3g
- Cholesterol: 25mg
Keywords: lemon bars, oatmeal bars, lemon crumble bars, dessert bars, easy lemon dessert