Looking for a frosting that tastes like summer? This Key Lime Marshmallow Buttercream is light, fluffy, and bursting with fresh key lime flavor.It starts with my Marshmallow Buttercream and adds bright key lime juice and zest for a sweet and tangy frosting.It is perfect for filling Key Lime Sandwich Cookies and just as tasty on cakes, cupcakes, cookies, and bars.

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 the frosting a rich, creamy base.Make sure it is at room temperature so it blends smoothly with the cream cheese.If using salted butter, you may want to lessen or leave out the salt.

Marshmallow Creme: Marshmallow creme (also called marshmallow fluff) gives this buttercream its light, fluffy texture and sweet marshmallow flavor.Store-bought works great, or you can make my Homemade Marshmallow Fluff for an extra special touch.Cream Cheese: Softened cream cheese adds a slight tang that balances the sweetness and pairs perfectly with the key lime.

Be sure it is at room temperature for the smoothest frosting.Confectioners’ Sugar: Confectioners’ sugar sweetens the frosting while keeping it silky smooth.Add it gradually so it mixes in easily.

Key Lime Juice: Fresh key lime juice gives the frosting its bright, citrusy flavor.Start with 1 tablespoon, then add more to taste.If you ca

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