These Key Lime Sandwich Cookies are like a little bite of summer! I took my buttery Key Lime Cookies and paired them with a fluffy, creamy Key Lime Marshmallow Buttercream filling to create a cookie that is sweet, bright, and full of fresh citrus flavor.They are perfect for sharing, gifting, or keeping a few extra for yourself! Want to save this recipe?Just enter your email and get it sent to your inbox! Plus you’ll get new recipes from us every week!Email *Save Recipe Ingredients & Substitutions Butter: Unsalted butter gives both the cookies and the buttercream a rich, creamy flavor.Make sure it is softened to room temperature so it mixes smoothly and creates the best texture.

Confectioners’ Sugar: Also called powdered sugar, confectioners’ sugar is used in both the cookies and the filling.It helps create a tender cookie texture and a smooth, creamy buttercream.Kosher Salt: Salt balances the sweetness and helps the bright key lime flavor stand out.

Key Limes: Fresh key limes bring bright, citrusy flavor to both the cookies and the marshmallow buttercream.The zest adds concentrated lime flavor without extra liquid, while the juice gives the cookies and filling their fresh, tangy taste.If you cannot find key limes, regular limes can be used instead.

Vanilla Extract: Vanilla adds a warm flavor that balances the citrus and sweetness in both the cookies and the filling.All-Purpose Flour: All-purpose flour gives the cookies structure wh

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