White sauce is basically glorified melted cheese on your pizza dough. What’s not to like? It might seem intimidating to make a roux (that’s the melted butter and flour combination that you add the milk to), but it’s actually pretty easy. When it starts to bubble all over, that’s your cue to slowly drizzle in the milk. Have a whisk ready before you start cooking, because that’s what keeps the sauce from clumping up.