Zesty Key Lime Cookies Recipe: Tangy Citrus Cookie Delight

Inspired by the bright flavors of the classic pie, these key lime cookies pair a chewy graham-cracker–style cookie with a silky sweetened condensed milk frosting and a tangy lime curd finish.

If you love key lime pie, meet a cookie version that’s likely to become a new favorite.

These start as a graham-cracker drop cookie that requires no chilling or rolling—perfect for quick baking, and so good you might eat a few straight from the tray.

But we don’t stop there: a smooth Russian-style buttercream made with butter and sweetened condensed milk is spread over the cooled cookies, then each one is finished with a bright drizzle of lime curd and a sprinkle of crushed graham crackers.

They’re decadent, playful and a delicious way to brighten an ordinary day.

Ingredients

Although this recipe has multiple components (cookie base, frosting and lime curd), it’s straightforward and relies mostly on pantry staples. The full ingredient list with measurements appears in the recipe card below.

Graham cracker cookies

• Unsalted butter: Melted butter gives these cookies a slightly fudgy, tender texture and is easier to incorporate than creamed butter.
• Brown sugar: Adds moisture and chewiness.
• Honey and cinnamon: These help recreate the characteristic graham-cracker flavor.
• Egg: Use a room-temperature egg to prevent the batter from seizing.
• Whole wheat flour: A touch of whole wheat flour brings the nutty, rustic flavor of graham crackers.
• Crushed graham crackers: Folded into the dough, they add pleasant texture.

Toppings

• Unsalted butter (room temperature): For the frosting—too cold and it will separate; too warm and it won’t hold shape.
• Sweetened condensed milk: Sweetens and adds the creamy, slightly caramel flavor reminiscent of key lime pie filling.
• Lime curd: Provides the punchy, tart lime flavor that defines this cookie.
• Vanilla extract (optional): Rounds out the frosting but can be omitted if you prefer the lime to dominate.

How to make key lime cookies

First, make the cookie dough.

Stir together melted butter, granulated sugar, brown sugar and honey until the sugar dissolves. Mix in the egg and vanilla, then fold in flour, salt, baking soda and cinnamon until nearly combined. Gently fold in most of the crushed graham crackers.

Second, bake the cookies.

Scoop 3-tablespoon portions of dough onto a parchment-lined baking sheet, spacing them about 2 inches apart. Bake at 350°F (175°C) for 10–11 minutes or until the tops are no longer shiny. Allow the cookies to cool on the baking sheet so they finish setting without drying out.

Third, make the frosting.

Whip room-temperature butter on high until light, pale and roughly doubled in volume (about 8–10 minutes). Add sweetened condensed milk in three additions, mixing on low between additions until just combined. If using, add a small amount of vanilla for balance.

Finally, assemble the cookies.

Spread a thin layer of the frosting over each cooled cookie. Drizzle with lime curd and sprinkle the remaining crushed graham crackers on top for crunch.

Scaling

This recipe scales easily—double or triple as needed. I don’t recommend halving it, as reducing the recipe can alter the egg-to-dry-ingredients ratio and produce a cakier cookie.

Storage

Unfrosted cookies: store at room temperature in an airtight container for up to one week.

Frosted cookies: refrigerate for up to 5 days once frosted and topped with curd.

More citrus desserts

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Key Lime Cookies

Notes

Nutrition

• Serving Size: 1 cookie
• Calories: 342
• Sugar: 25.3g
• Sodium: 270mg
• Fat: 37.8g
• Saturated Fat: 12.1g
• Carbohydrates: 36.6g
• Fiber: 0.6g
• Protein: 4.2g
• Cholesterol: 98mg