My wife is an RN and supvsr/manager of 3 shifts of staff@ 20-25 per shift.
She finds that flowers and/or fruit baskets /goodie baskets are deeply appreciated and everybody can have some.
One basket per shift (albeit a moderately large one) is how she thanks her staff of RN's, LPN's, aides, secretaries, etc. She often shops around for things and collects tins of special imported cookies on sale, or crackers, cheeses & sausages like salami, different mustards, etc, are good too- and she makes them up herself.