I used the same white cake recipe that I have posted before from foodnetwork.com. You can find it here. All I did was add 2 tsp of Root Beer Concentrate with the vanilla. I did end up baking the cake for about 5 minutes longer than the original recipe stated but I am not sure why. So keep an eye on it and see how it does at your house.
Then I used this vanilla icing recipe.
Despite my son deciding he was going to try the cake too (before I had removed it from the pan he had a golf ball sized hole in the cake) the cake was great!
It was super moist and had just enough root beer flavor. I brought this with to a dinner we were invited to and everyone loved it.
I hope you enjoy this recipe! :)