Stir in the 1 3/4 cups of both the broth and milk and bring to a boil. Cover, reduce to a simmer, and cook, stirring regularly to ensure that the pasta isn't sticking to the bottom of the pot, until the orzo is al dente and most of the liquid is absorbed and has formed a creamy sauce, about 8 or so minutes.
Leftovers can be rewarmed with a bit more milk in a sauce pan over medium low heat.
Recipe is a riff on the one found here over at The Kitchn