Key Lime Marshmallow Buttercream
This Key Lime Marshmallow Buttercream is light, fluffy, and packed with bright key lime flavor! It is the perfect sweet and tangy filling for Key Lime Sandwich Cookies, but it is also amazing on cakes, cupcakes, brownies, and more.
Servings: 3 cups
Calories: 3669kcal
Ingredients
- ½ cup (1 stick / 113 g) unsalted butter, room temperature
- 1 jar (7 ounces) marshmallow creme (marshmallow fluff)
- 4 ounces cream cheese, room temperature
- 4 cups (500 g) confectioners' sugar
- 1 to 2 tablespoons key lime juice
- 1 teaspoon key lime zest
- 1 pinch kosher salt
- ½ teaspoon vanilla extract
Instructions
- In the bowl of a stand mixer fitted with the paddle attachment, beat the butter and cream cheese until smooth and creamy, about 2 minutes.
- Add the marshmallow creme and mix until fully incorporated, scraping down the sides of the bowl as needed.
- With the mixer on low speed, gradually add the confectioners' sugar, mixing until smooth and combined.
- Add 1 tablespoon of the key lime juice, the key lime zest, kosher salt, and vanilla extract. Mix until fully incorporated.
- Taste the frosting and add the remaining tablespoon of key lime juice, if desired, until it reaches your preferred balance of sweetness and citrus flavor.
- Increase the mixer speed to medium-high and beat for 1 to 2 minutes, or until the frosting is light and fluffy.
- Use immediately to frost cakes, cupcakes, cookies, or bars.
Nutrition
Serving: 1recipe key lime marshmallow buttercream | Calories: 3669kcal