Name: Key Lime Pie Sandwich Cookies
Prep time: 20 min
Cook time: 10 min
Total time: 30 min
Cuisine: American
Ingredients: 1 cup butter, room temperature; 1 cup light brown sugar, packed; 1/4 cup granulated sugar; 2 eggs; 1 tablespoon vanilla extract; 2 1/2 cups all-purpose flour; 1 cup graham cracker crumbs (about 9 full crackers); 1 teaspoon baking soda; 1/2 teaspoon salt; 1/2 cup butter, room temperature (for filling); 4 ounces cream cheese, room temperature (for filling); 2 1/2 cups powdered sugar (for filling); 2 tablespoons key lime juice (for filling); 1 teaspoon key lime zest (for filling)

Why You’ll Love Key Lime Pie Sandwich Cookies Recipe

These cookies combine the familiar, beloved taste of key lime pie with the fun of cookie sandwiches. With soft graham‑style cookies and a creamy lime frosting sandwiched between, every bite delivers balanced sweetness and citrus zing. This recipe is easy enough for home bakers of all levels and makes about a dozen and a half delightful treats.

Ingredients

(Tip: You’ll find the full list of ingredients and measurements in the recipe card below.)

Graham Cookies
1 cup butter, room temperature
1 1/2 cups light brown sugar
2 large eggs
2 teaspoons vanilla extract
2 cups graham cracker crumbs
1 teaspoon baking soda
1 teaspoon kosher salt
2 cups all‑purpose flour

Key Lime Buttercream Filling
1/2 cup butter, room temperature
1 tablespoon lime zest
3 tablespoons freshly squeezed key lime juice
4 cups powdered sugar

Directions

Preheat your oven to 350°F (175°C). Line baking sheets with parchment paper.
In a large bowl, cream together the butter and brown sugar until light and fluffy.
Add eggs and vanilla, mixing until smooth.
With the mixer on low, add graham cracker crumbs, baking soda, and salt. Mix until incorporated.
Gradually add the all‑purpose flour and mix until just combined.
Use a cookie scoop to drop the dough about 2 inches apart on the prepared baking sheets.
Bake 9–10 minutes, or until the edges are just golden. Let the cookies cool on the pan for 2–3 minutes, then transfer to a wire rack to cool completely.
While cookies cool, prepare the filling. Beat the butter and lime zest until smooth. Slowly add powdered sugar and key lime juice, then beat on medium until creamy.
Flip half of the cooled cookies upside down and pipe about 2 tablespoons of buttercream onto each, then top with another cookie to form a sandwich.

Servings and timing

Yield: about 15 sandwich cookies
Prep time: ~30 minutes
Cook time: ~10 minutes
Total time: ~40 minutes

Variations

Add a sprinkle of graham cracker crumbs on top of the buttercream for extra texture.
Mix in a few drops of green food coloring to the buttercream for a more vibrant look.
Include a thin layer of white chocolate ganache inside the sandwich for a richer dessert.
Use lime zest from regular limes if key limes aren’t available, though the flavor will be slightly less tangy.
For a tropical twist, add a tiny bit of coconut extract to the cookie dough.

Storage/Reheating

Store these cookies in an airtight container at room temperature for up to 3 days. For longer storage, freeze the assembled cookies in an airtight container for up to 2 months and let thaw at room temperature before serving.

FAQs

What are the best limes to use for key lime flavor?

Key limes are smaller and more aromatic than regular limes, giving a distinctive, bright citrus flavor. If you can’t find them, regular limes can be used, but the flavor may be milder.

Can I make the cookie dough ahead of time?

Yes — the cookie dough can be prepared and refrigerated for up to 24 hours before baking.

Can I use bottled lime juice instead of fresh?

Fresh key lime juice provides the best flavor. Bottled juice works in a pinch but may be less vibrant.

How do I keep the cookies from spreading too much?

Chilling the dough briefly before baking can help reduce spreading and maintain a round shape.

Can I substitute regular sugar for brown sugar?

Yes, you can use granulated sugar instead of brown sugar, though it may slightly affect texture.

Can I make these gluten‑free?

Yes — substitute a gluten‑free all-purpose flour blend that measures cup-for-cup with regular flour.

How do I prevent the buttercream from being too runny?

Ensure your lime juice is measured accurately and not excessive. Adding powdered sugar gradually helps control consistency.

Can I add food coloring?

Yes — a few drops of green food coloring can enhance the lime theme, but it’s optional.

Are these cookies good for parties?

Definitely — their bright flavor and fun presentation make them great for gatherings or summer celebrations.

Can I freeze just the cookies or only the filling?

You can freeze baked cookies before assembling for up to 3 months, and the filling can be stored in the freezer for a similar time in an airtight container.

Conclusion

Enjoy the bright, creamy flavors of key lime pie in a fun, handheld cookie sandwich. These treats are perfect for summer, parties, or anytime you want a citrus-forward dessert that’s both sweet and tangy.

Key Lime Pie Sandwich Cookies