Uses for rum flavored butter

We recently fat washed some rum to infuse it with butter flavor for holiday drinks over Thanksgiving. The byproduct is some rum flavored butter.

Here is the video we followed: https://youtu.be/cCbEwyntSCM

I would love to use it for holiday desserts. My first thought is to make buttercream frosting.

Any other brilliant thoughts from this cooking collective?

bon appetit