We love using Garlic Scape Pesto for this dish, but if you can't find any, use any kind of Pesto you like.
Keep on the heat so the sauce starts to thicken right away. Add salt and pepper, whisking constantly.
When mixture thickens, slowly add the milk while stirring.
Keep heating and once thickened, add the cheese.
Add the pesto.
Meanwhile, cook noodles then strain well.
Stir the pesto sauce into the cooked noodles.