Use a vegetable peeler to remove a long piece of zest from the orange, working your way around the fruit.
Combine the bourbon and bitters in a tall glass. Twist the orange zest over the glass to release the oils, then drop it in. Fill the glass halfway with ice. Add the root beer.
Slowly pour the cream over the back of a spoon into the glass so it floats on top.
Photograph by Kang Kim
Recipe courtesy Food Network Magazine