I am making a root beer flavored cake for a 4 year old boy's birthday. I am trying to think of how I could make the filling taste like vanilla ice cream, so overall the cake would taste like a root beer float. I kn I have seen a recipe like this somewhere, and now I can't find it!

I'd appreciate any suggestions!

Thanks

Toba Garrett has one in her book "The Well Decorated Cake" called French Vanilla Buttercream that she describes as tasting like vanilla ice cream, I haven't tried it myself though.

If you have a restraurant supplier or a snowball supplier they sell Ice Cream concentrate for SnoBalls use it as a flavor you would add to buttercream frosting. If you can find SouthernSnow or SnoWizard concentrates they are the 2 I am familar with and I would recommend either one.
Yes these concentrates are very tasty in Buttercream.

I would try using a french vanilla coffee creamer as your liquid for the buttercream and getting some vanilla bean paste to add to it.

I use the french-vanilla coffee mate in my buttercream with vanilla and butter flavorings. Tastes like vanilla ice-cream!

Make your buttercream with melted vanilla ice cream...maybe????