Ingredients
Equipment
Method
- Step 1: Preheat Oven and Prepare Pan: Preheat oven to 350°F (175°C). Line a 9x9-inch baking pan with parchment paper, making sure to leave an overhang on two sides for easy lifting.
- Step 2: Make the Crust: In a large mixing bowl, whisk together the all-purpose flour, granulated sugar, light brown sugar, salt, and baking powder until well combined. Pour in your melted and cooled unsalted butter. Mix until the mixture comes together and looks beautifully crumbly.
- Step 3: Bake the Crust: Take about two-thirds (⅔) of the crumb mixture and press it evenly and firmly into the bottom of your prepared 9x9-inch baking pan to form a compact base. Bake for 15 minutes, or until the edges start to turn lightly golden.
- Step 4: Prepare the Lemon Filling: While the crust bakes, whisk together the sweetened condensed milk, large egg yolks (room temperature), heavy cream, and salt in another large bowl until smooth. Gradually whisk in the fresh lemon juice; the mixture will start to thicken slightly.
- Step 5: Assemble and Bake: Once your crust is lightly golden, carefully pour the lemon filling evenly over the hot crust. Take the remaining one-third (⅓) of your crumb mixture and sprinkle it evenly over the top of the lemon filling.
- Step 6: Final Bake: Put the pan back into the oven and bake for an additional 15-20 minutes. The bars are done when the crumb topping is golden brown and the lemon filling looks set (it might still jiggle just a tiny bit in the very center).
- Step 7: Cool and Chill: Let the bars cool completely at room temperature on a wire rack (1-2 hours). Once completely cooled, transfer the pan to the refrigerator and chill for at least 4 hours, or overnight, which is crucial for the filling to set up firm enough for clean slices.
Notes
Substitutions & Additions: For citrus swaps, try using lime juice for Key Lime Crumb Bars, or a mix of lemon and orange juice. For a nutty crumb, add ½ cup of finely chopped pecans or walnuts to your crumb mixture. For a coconut delight, stir in ½ cup of shredded unsweetened coconut to the crumb mixture. A handful of fresh blueberries or raspberries sprinkled over the lemon filling before adding the top crumb can add a lovely burst of color and fruitiness. For an even more intense lemon flavor, add 1-2 teaspoons of lemon zest to the filling mixture.
Tips for Success: Fresh lemon juice is key for a bright, vibrant flavor. Ensure your melted butter is cooled before mixing it with the dry ingredients to prevent a tough crust. Don't overbake the crust on its first bake—it should be lightly golden. Patience with chilling is crucial for a perfectly set, creamy filling and clean slices. When pressing the bottom crust and sprinkling the top crumb, try to be as even as possible for uniform texture and baking.
How to Store Lemon Crumb Bars: Due to the egg yolk and dairy in the filling, these bars are best stored in the refrigerator in an airtight container for up to 5-7 days. Lay parchment paper between layers if stacking them. To freeze, once completely chilled and sliced, place the bars in a single layer on a baking sheet and freeze until solid. Then, transfer them to an airtight freezer-safe container or freezer bag for up to 2-3 months. Thaw in the refrigerator before serving.