Thanks to the onset of root beer flavored ales, there are several ways of making an easy root beer float cocktail. You can simply add a scoop of vanilla ice cream to any root beer flavored beer. Not complicated but not all that interesting either.
Another option? Back in the seventies we used to drop a jigger of root beer schnapps right into a pint of regular beer for an alcoholic root beer treat and all you'd have to do is add a scoop of ice cream to that. Pretty darn sweet, but it works as well.
However, my favorite root beer cocktail is this version. Thanks to the addition of some bitters it is less sweet and has way more depth of flavor.
ROOT BEER FLOAT
1-1/2 Oz. Vodka
1 Oz. Root Beer Schnapps
1 Scoop Vanilla Ice Cream
2 Dashes Chocolate Bitters
Shake the vodka, root beer schnapps and bitters with ice until chilled.
Add the scoop of ice cream to your chilled glass.
Strain the chilled vodka and root beer vodka over the ice cream.
Add a spoon and straw then serve.
ROOT BEET FLOAT
Simply switch to a highball or Collins glass, fill with ice and top the chilled vodka, root beer schnapps and chocolate bitters with some actual root beer just before adding the ice cream.
(I prefer to add the ice cream at the end because adding it before the root beer creates too much soda foam.)