How to Make Marshmallow Buttercream Frosting

Beginner 10 min 16 steps 21564 views Rating: 3.6/5 Published: 2026-04-15

Heat the water, sugar, and corn syrup.. Beat the egg whites until foamy.. Mix the cream of tartar and salt into the egg whites until peaks form.

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Steps

1

Heat the water, sugar, and corn syrup.

Step 1

Heat the water, sugar, and corn syrup.

2

Beat the egg whites until foamy.

Step 2

Beat the egg whites until foamy.

3

Mix the cream of tartar and salt into the egg whites until peaks form.

Step 3

Mix the cream of tartar and salt into the egg whites until peaks form.

4

Remove the sugar mixture from the heat and allow it to rest.

Step 4

Remove the sugar mixture from the heat and allow it to rest.

5

Add the sugar mixture to the egg whites.

Step 5

Add the sugar mixture to the egg whites.

6

Stir in the vanilla.

Step 6

Stir in the vanilla.

7

Beat the butter until smooth.

Step 7

Beat the butter until smooth.

8

Add marshmallow fluff and powdered sugar in intervals.

Step 8

Add marshmallow fluff and powdered sugar in intervals.

9

Mix in the salt and beat until combined.

Step 9

Mix in the salt and beat until combined.

10

Cream the butter.

Step 10

Cream the butter.

11

Stir in the powdered sugar.

Step 11

Stir in the powdered sugar.

12

Mix in the milk.

Step 12

Mix in the milk.

13

Place the marshmallows on a lined baking sheet.

Step 13

Place the marshmallows on a lined baking sheet.

14

Broil the marshmallows until browned.

Step 14

Broil the marshmallows until browned.

15

Combine the toasted marshmallows with the butter mixture.

Step 15

Combine the toasted marshmallows with the butter mixture.

16

Allow the frosting to cool completely before using it.

Step 16

Allow the frosting to cool completely before using it.

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