So, how do you actually freeze buttercream frosting? It's pretty simple, really! Just portion out the frosting into airtight containers or freezer bags, making sure to remove as much air as possible before sealing.
Can You Freeze Buttercream Frosting? - The Capitol Baker
Then, label the containers or bags with the date and flavor, and pop them into the freezer. When you're ready to use the frosting, just thaw it in the fridge or at room temperature, and give it a good mix before using.
And, voila! You've got fresh frosting, ready to go. It's like having your own personal frosting stash, just waiting to be used whenever you need it.