These lemon sugar cookie bars are soft, tender, and bursting with bright citrus flavor. Baked in a 9×13 pan, this easy lemon dessert uses my sugar cookie bars recipe as the base for a simple, crowd-pleasing treat.
Perfect for birthdays, potlucks, or a simple afternoon snack, these lemon sugar cookie bars combine the best parts of a sugar cookie and lemon shortbread — only much softer and almost melt-in-your-mouth. If you love lemon-forward cookies, these deliver a bright, frosted lemonade-style flavor in an easy bar form.
What Makes These The Best Lemon Cookie Bars?
- Super soft texture: The bars stay tender and buttery with a pleasant, delicate crumb that melts in your mouth.
- No cookie cutters needed: Everything is made in a 9×13 pan and sliced with a knife for fast, uniform bars.
- Freezer-friendly: These bars freeze well, so you can keep a batch on hand for last-minute cravings.
- Bright lemon flavor: The lemon buttercream really makes the bars taste like a frosted lemonade — fresh, sweet, and tangy.
Ingredients Needed For Sugar Cookie Bars:
- Cookie dough: Unsalted butter, granulated sugar, large egg, vanilla extract, lemon extract, baking powder, salt, all-purpose flour.
- Lemon buttercream: Unsalted butter, powdered sugar, vanilla extract, lemon extract, fresh lemon juice (optional), pinch of salt, optional yellow food coloring.
- Tools: 9×13 metal baking pan, parchment paper, spatula, large sharp knife.
Tip: If you prefer individual cookies instead of bars, try my soft and thick lemon sugar cookie recipe for a similar flavor in cookie form.
How To Make Frosted Lemon Cookie Bars
Step 1: Make the dough and bake
Preheat the oven to 350°F. Cream the butter and sugar together, add the egg, vanilla, and lemon extract, then stir in baking powder, salt, and flour until just combined. Press the dough into a greased and parchment-lined 9×13 metal pan and bake until you see the slightest hint of browning at the edges. Let the pan cool completely before frosting.
Tip: If the dough is sticky, place another sheet of parchment on top and press the dough into the pan for an even surface.
Step 2: Make the lemon buttercream
While the bars bake and cool, beat together the butter and powdered sugar, then add vanilla, lemon extract, and fresh lemon juice for brightness. Beat until light and fluffy. A drop of yellow food coloring is optional to enhance the appearance.
Tip: For a more intense lemon flavor, increase the lemon extract slightly to taste — many home bakers prefer a bolder lemon profile.
Step 3: Frost and cut
Spread the cooled bars with the lemon buttercream using an offset spatula or butter knife for a smooth layer. Chill for about 30 minutes if you want firmer frosting that’s easier to slice. Use a large, sharp knife and wipe it between cuts for clean edges. Garnish with a little lemon zest, if desired.
Tip: Try topping the bars with a complementary frosting or a dusting of zest for variation — fresh berries also pair nicely.
Storage & Freezing
How long can I keep these lemon bars?
Store bars in an airtight container at room temperature for 2–3 days; they will begin to dry out after that. For longer storage, freeze the bars for up to 1–2 months in a freezer-safe container or individually wrapped to preserve freshness.
Can lemon sugar cookie bars be frozen?
Yes. Wrap individual bars in plastic wrap and place them in a freezer-safe bag or container. Thaw at room temperature or enjoy straight from the freezer for a cool, refreshing treat.
Frequently Asked Questions:
Chill the frosted bars in the refrigerator for about 30 minutes so the frosting firms up. Use a large, sharp knife and wipe the blade between cuts to get even, clean squares.
You can swap the buttercream for a lemon-flavored cream cheese frosting (double the batch if needed) or a simple lemon glaze made with powdered sugar and lemon juice. Royal icing also works if you want a firm, decorated finish; just be sure your lemon extract is oil-free if using royal icing.
Lemon Sugar Cookie Bars
Ingredients
- 1 cup unsalted butter (2 sticks), softened
- 1 cup granulated sugar
- 1 large egg
- 2 teaspoons vanilla extract
- 1 tablespoon lemon extract
- 1 ½ teaspoons baking powder
- ½ teaspoon salt (omit if using salted butter)
- 2 ¼ cups all-purpose flour
- ½ cup unsalted butter (1 stick), softened
- 2 cups powdered sugar
- 1 teaspoon vanilla extract
- 1 ½ teaspoons lemon extract
- 1 tablespoon fresh lemon juice (optional)
- Drop of yellow food coloring (optional)
Instructions
- Preheat oven to 350°F. If the butter isn’t softened, microwave briefly to slightly soften.
- Cream together 1 cup unsalted butter and 1 cup granulated sugar on medium speed for 20–30 seconds. Add 1 large egg, 2 teaspoons vanilla extract, and 1 tablespoon lemon extract, mixing until combined.
- Add 1 ½ teaspoons baking powder, ½ teaspoon salt, then add 2 ¼ cups all-purpose flour ½ cup at a time on low speed. Mix just until the flour disappears. Do not overmix.
- Spray a metal 9×13 pan with cooking spray and line it with parchment paper. Press the dough evenly into the pan.
- Bake at 350°F for 14–16 minutes. Remove when the edges show the tiniest bit of color — the center may look slightly underdone, which is fine.
- Allow the bars to cool completely before frosting. Chill in the refrigerator to speed cooling if desired.
- Beat ½ cup unsalted butter on medium speed for 1–2 minutes until light and creamy.
- Slowly add 2 cups powdered sugar, 1 teaspoon vanilla extract, and 1 ½ teaspoons lemon extract. Beat on high for 2 minutes until fluffy. Add 1 tablespoon fresh lemon juice and beat 30 seconds more. Add a drop of yellow food coloring if desired. If the frosting is too thick, thin with a splash of milk.
- Spread the frosting over cooled bars. Add sprinkles immediately if using. Chill about 30 minutes for easier slicing, then cut into 24 squares with a large, sharp knife, wiping the blade between cuts.
- Store in an airtight container for 2–3 days at room temperature or freeze wrapped for up to 1–2 months.
Notes from Melissa
Nutrition
Did you make this?
I’d love to hear your thoughts and see your photos. Leave a review and tag your creation to share your feedback!