• Preheat oven to 375°F. Line a baking sheet with parchment paper.
• In a large bowl, cream together the butter, confectioners’ sugar, salt, and key lime zest until light and fluffy, about 3 to 4 minutes.
• Add the key lime juice and vanilla extract. Mix until combined.
• Add the flour and mix just until a soft dough forms. Do not overmix.
• Scoop dough into portions about 2 tablespoons each. Roll into balls and place on the prepared baking sheet.
• Using the bottom of a glass, gently flatten each cookie to about ½-inch thickness.
• Bake for 10 to 13 minutes, or until the edges are set and just barely golden.
• Let cookies cool completely on the pan or transfer to a wire rack before frosting.

Key Lime Cream Cheese Frosting

• In a large bowl, beat the cream cheese and butter until smooth and creamy.
• Add the key lime juice, zest, and salt. Mix until combined.
• Gradually add the confectioners’ sugar, mixing until the frosting is smooth and spreadable. It should hold its shape when piped. If needed, add a small splash of milk or additional lime juice to reach your desired consistency.
• Spread or pipe a generous swirl of frosting onto each cooled cookie.