What should I give the office staff at work (that I am also friendly with) as a holiday gift, spending under $20 each?

What’s a good gift (or variety of gifts) for the office clerks at work, who are helpful to me? it could be a variety of smaller gifts in a gift bag or basket, or it could be one thing. I shop at Costco and Sam’s so I do get things cheaper in quantities, also. I am clever and crafty so can attractively package whatever I purchase. I am friends with these girls but they are also my subordinates and are helpful to me, so I would like to show them some appreciation in the form of a holiday gift. They are in their 20’s.