1) Cheesy bechamel sauce 2) Cheesy French sauce 
Béchamel sauce containing cheese. Also the name given to a dish coated with cheese sauce before grilling.
a cheese sauce, made with a base of white sauce.
classic cream sauce enriched with egg yolks and cheese.
cheese sauce
Also called(“Pope of the Huguenots”), 1549–1623, French statesman and Protestant leader. · (often l.c.) Also calleda béchamel, or white sauce, containing cheese, esp. Parmesan and Gruyère.