Lemon Crumb Squares Recipe

If you’re looking for a bright and zesty treat that combines a satisfyingly crumbly texture with a luscious lemon filling, this Lemon Crumb Squares Recipe is an absolute must-try. It effortlessly balances the nutty crunch of oats and buttery crust with a tangy, creamy lemon layer that feels like sunshine on your taste buds. Perfect for any occasion, these squares offer a delightful harmony of flavors and textures that will quickly become a beloved favorite in your baking repertoire.

Ingredients You’ll Need

This Lemon Crumb Squares Recipe keeps things wonderfully straightforward, using simple pantry staples that come together to create a complex and memorable dessert. Each ingredient plays a vital role in building the perfect crumbly base, a creamy tart filling, and a golden topping that will have everyone asking for the recipe.

• 1 cup all-purpose flour: Provides structure and a tender crumb to the base and topping.
• 1 cup old-fashioned oats: Adds rustic texture and a hearty, nutty dimension to the crumble.
• ¼ teaspoon salt: Enhances flavor by balancing sweetness.
• ¾ teaspoon baking soda: Helps the crust rise slightly for a light, crisp bite.
• 10 tablespoons unsalted butter, melted: Brings richness and binds the crumb mixture beautifully.
• ½ cup packed light brown sugar: Adds caramel notes and moisture to the crust and topping.
• 1 teaspoon pure vanilla extract: Infuses a sweet aromatic depth that complements lemon perfectly.
• 1 (14 oz) can sweetened condensed milk: Creates a creamy, sweet base for the lemon filling.
• 2 tablespoons sour cream or plain yogurt: Adds subtle tang and softens the filling’s texture.
• 1 large egg yolk: Richens the filling and helps it set smoothly.
• ¼ cup freshly squeezed lemon juice: The star ingredient delivering fresh, vibrant citrus brightness.
• 1 heaping tablespoon finely grated lemon zest: Intensifies lemon flavor with aromatic oils right from the peel.

How to Make Lemon Crumb Squares Recipe

Step 1: Prep Your Oven and Pan

Kick off your baking adventure by preheating your oven to 350°F. Line an 8×8-inch baking pan with parchment paper, which will make removing your lemon crumb squares a breeze later on. This simple prep step ensures even baking and quick cleanup.

Step 2: Combine Dry Ingredients

In a medium bowl, whisk together the all-purpose flour, oats, salt, and baking soda. These ingredients form the backbone of your crumb base and topping, creating a perfect balance of chewiness and crumbly texture.

Step 3: Mix Wet Ingredients and Form Dough

In a separate bowl, blend the melted butter, brown sugar, and vanilla extract until smooth and fragrant. Pour the dry ingredients into the wet mixture and stir gently until it just comes together. This careful mixing keeps the crumb tender yet sturdy enough to hold the lemon filling.

Step 4: Divide and Press the Dough

Reserve about ¾ cup of this dough for the topping. Press the remaining dough evenly into your prepared pan, creating a uniform crust layer that will bake up golden and crisp.

Step 5: Parbake the Crust

Bake the crust in your preheated oven for approximately 10 minutes, just until it turns lightly golden. This step allows the base to set and prevents it from getting soggy once you add the luscious lemon filling.

Step 6: Whisk Together the Lemon Filling

While the crust bakes, combine the sweetened condensed milk, sour cream or yogurt, egg yolk, lemon juice, lemon zest, and a splash of vanilla extract in a bowl. Whisk everything until perfectly smooth and creamy, ensuring that bright lemon flavor shines through every bite.

Step 7: Layer and Crumble

Pour this divine lemon filling over the freshly baked crust, spreading it evenly. Then crumble the reserved dough over the top, creating that classic crumbly, buttery layer that adds texture and a beautiful golden finish.

Step 8: Final Bake

Return the pan to the oven and bake for 17 to 20 minutes, or until the top turns golden brown and the filling is set but still slightly tender. The scent of baked lemon and buttery crumbs filling your kitchen at this point is absolutely irresistible.

Step 9: Cool and Slice

Once baked, allow the lemon crumb squares to cool completely in the pan. This cooling step is essential for the filling to firm up enough so you can slice neat, beautiful squares without any mess.

How to Serve Lemon Crumb Squares Recipe

Garnishes

Elevate your lemon crumb squares by dusting a light sprinkle of powdered sugar or finely grated lemon zest on top. You can also add a few thin lemon slices or fresh mint leaves for a pop of color. These simple garnishes add elegance and a refreshing boost to each bite.

Side Dishes

These squares pair beautifully with a dollop of whipped cream or a scoop of vanilla ice cream for an indulgent twist. For a lighter option, serve alongside fresh berries or a hot cup of herbal tea to complement the citrus brightness.

Creative Ways to Present

If you’re serving these at a party or gathering, consider presenting the Lemon Crumb Squares Recipe on a decorative platter lined with lemon leaves or edible flowers. You can cut them into mini bites for easy finger-food style or stack them between layers of parchment for a charming gift box surprise.

Make Ahead and Storage

Storing Leftovers

Leftover lemon crumb squares keep well stored in an airtight container at room temperature for up to three days. Keep them out of direct sunlight to maintain their vibrant lemon flavor and crumbly texture. For longer storage, refrigeration is a good option but may slightly firm up the filling.

Freezing

You can freeze these squares for up to two months. Slice them first, then arrange pieces in a single layer on a baking sheet to flash freeze before transferring to a freezer-safe bag or container. This helps maintain their crumbly topping and prevents sticking.

Reheating

To enjoy these squares after freezing, thaw them overnight in the fridge. Warm individual portions in a microwave for 15 to 20 seconds to bring back their soft, luscious texture without compromising the delightful crumb layer.

FAQs

Can I substitute the oats with something else?

If you don’t have oats or prefer a different texture, finely chopped nuts or shredded coconut can add an interesting twist to the crumb topping and base. Just keep in mind it will alter the flavor and crunch.

Is it necessary to use sour cream or yogurt in the filling?

Yes, the sour cream or yogurt adds a subtle tang and creaminess that balances the sweetened condensed milk and lemon juice, creating a smooth, rich filling. You can try Greek yogurt for a thicker texture.

Can I use bottled lemon juice instead of fresh?

Freshly squeezed lemon juice is highly recommended because it delivers a bright, fresh taste and authentic aroma that bottled lemon juice often lacks. However, if you’re in a pinch, bottled lemon juice can work but use a bit less and consider adding extra zest.

How do I know when the filling is done baking?

You’ll want the filling to appear set with a slight jiggle in the center when you gently shake the pan. If it’s still liquidy, bake for a few more minutes but be careful not to overbake as it can dry out the filling.

Can I make these squares gluten-free?

Absolutely! Substitute the all-purpose flour with a gluten-free blend suitable for baking and ensure your oats are certified gluten-free. The texture might vary slightly but the flavor will be just as delightful.

Final Thoughts

This Lemon Crumb Squares Recipe is truly a gem—bright, buttery, and bursting with lemony goodness in every crumbly bite. Whether you’re baking for family, friends, or just treating yourself, these squares deliver comfort and cheer in the most delicious way. Give it a try, and I promise it will become one of your go-to lemon desserts that you’ll want to make again and again!

Print