I have fallen in love with basic "white sauce" some people call it "béchamel sauce." same thing (or even "white gravy.) Im a total dip/sauce person and this sauce tastes good with EVERYTHING: Mixed with pasta, layered over lasagna, poured over gnocchi, and/or as a sandwich spread or dip. And it only takes 5 minutes to make it.
5 Tablespoon flour
4 Tablespoon butter
1/2 cup cream or half-and-half (3/4 cup for thinner)
1/8-1/4 teaspoon salt.
Melt butter on Low in small saucepan. Raise heat to med. Add 1.5 T flour and stir constantly with spatula until roux is formed. If roux doesn't form, add 1/2 T more flour. Add milk and stir constantly over medium heat until sauce is thick (takes just a couple minutes, if even that.) Stir in 1/8 teaspoon salt. Taste the sauce and add up to 1/8 t more salt if needed.