I just got a batch of SMBC out of the freezer, and when I thawed it out and tried it on a cupcake the vanilla flavor is so overpowering. I can even taste the alcohol from the extract. It was great when it was fresh, but not so much anymore. Any way to salvage this? I've frozen SMBC a bunch of times but never had it come out tasting stronger.

Could you just leave it uncovered on the counter and give it a stir every half hour or so? That might help some of the alcohol to evaporate out. You could also add some lemon juice (but that's usually only to cut sweetness), but I wouldn't add anymore extracts. That would just amplify the alcohol flavor.

Maybe try adding some white chocolate? The addition of a different flavoring might help to drown out the vanilla? But, totally just a guess! LOL