The phrase "a splendid cook" is correct and usable in written English.
You can use it to describe someone who is exceptionally skilled at cooking.
Example: "My grandmother was a splendid cook, always preparing delicious meals for the family."
Alternatives: "an excellent cook" or "a fantastic chef."
She was a splendid cook, a talented seamstress and a committed volunteer.
Mary was a serious hostess and a splendid cook, and, more to the point, the only other person I knew who served Thanksgiving dinner out of season.
By Alice Frankforter The New Yorker, March 26 , 1932P. 47 Tells of Mrs. Bigsby, a splendid cook who in her own humble home Has been twice widowed and has seven children and a Swedish husband.
Gino Angelini has been cooking in Los Angeles for so long, and in so many restaurants more ambitious, that even if you have spent dozens of happy evenings in this cheerful dining room eating tripe, tagliolini with lemon, or his grandmother's green lasagna, it is sometimes easy to underestimate what a splendid cook he can be.
She and Alford are splendid cooks — which doesn't always follow from being splendid cookbook writers — but if dinner on Henry Street is "less good" sometimes, she says, "it's not the end of everything".
We buy bags of fresh, local food and cook a splendid roast (feeling slightly guilty about the lamb) in those fancy pans.
Nicoletta cooked a splendid lunch of pasta with Bolognese-style ragù sauce: half beef mince, a quarter pork and a quarter veal.
"You are such a good cook and a splendid driver and a very, very good daughter.
Cook 22 b Sharma (England 53-1) A splendid delivery from a splendid little spell.
It now serves a splendid Sunday roast (pricey but worth it) and a home cooked British food – fish and chips, pie and mash, etc.
A cooked-to-order filet mignon was napped with a splendid bearnaise sauce and crowned with two jumbo shrimp scampi.
