Thick & Rich Italian Hot Chocolate

In a small bowl, combine 3 tablespoons of the half-and-half with the cornstarch, whisking until smooth. Place the remaining half-and-half in a small saucepan over medium heat. Bring to a simmer. When the half-and-half begins to bubble around the edges, whisk in the sugar. Whisk in the cornstarch mixture until the half-and-half thickens slightly, usually less than a minute. Remove from the heat and quickly whisk in the chocolate until very smooth. Pour into two cups, topping with whipped cream or marshmallows if desired.