After going to BJ's Brewhouse for the first time a few months ago, and having their delicious Irish Root Beer, Clint and I decided to find a recipe/make our own that matched their recipe. It may be a little stronger than what they serve, but it is so so good.
1 oz Jameson Irish Whiskey (I'm sure other whiskey would work too)
1/2 oz Bailey's Irish Cream
1/2 oz Butterscotch Schnapps
1/2 oz cream
12 oz Root Beer
1. Add the ingredients into a chilled glass in the order above. Top with cold root beer. Serve!
*You do not have to add the cream, BJ's Irish Root Beer doesn't have cream in it. It just makes it a little creamier and tastier.