In a large bowl, add the heavy cream. Using a handheld mixer, beat the heavy cream for a few minutes until stiff peaks form.
Add the can of condensed milk and fold into the heavy cream mixture. Once combined, add the marshmallow fluff.
I like to start with a spoon or spatula to start mixing and then move to a whisk to get the mixture a little smoother. It’s also really tasty to leave some bigger pieces of the marshmallow fluff in there too. Totally up to you.
Once combined and mixed together, transfer mixture to a container, pan or ice cream container and cover with plastic wrap. Place in the freezer and freeze for several hours and ideally overnight.
Remove from the freezer and scoop, serve and enjoy! Add on top of a warm brownie, so good!