To a short glass, add 2 scoops of vanilla ice cream.
Top with stout beer taking care to not let the foam overflow.
Let the foam subside, then top with more beer.
Look for a stout beer that is flavored. The one I'm using is Peanut Butter flavored but I've also used Chocolate Stout and Banana Bread Stout.
To keep the foam down, you can use place a spoon in the glass, backside up, and pour the beer down the back of the spoon into the glass. I learned this trick when I worked the soda fountain in a 40's diner. I actually like the foam as part of this recipe. You do you.
You can play up the dessert side of this beer ice cream float by topping it with whipped cream, chocolate syrup and chocolate shavings.
Don't like beer but still want an alcoholic float? Try hard root beer instead!