These are all typically Dutch foods. The ones I put in 'suggestion' are the most famous ones, but other nice examples/additions are: beschuit met muisjes (served to guests when a child is born, blue for boys, pink for girls, picture can be found here: https://www.eenmanierom.nl/beschuit-met-muisjes/), haring (herring), boerenkoolstamppot met worst, snert (green pea soup), licorice.

We eat oliebollen (fried dough) on NYE, commonly with raisins and powdered sugar. Poffertjes are often served with powdered sugar and butter. I guess most people know stroopwafels, cheese and hagelslag (chocolate sprinkles on bread :D) and since I'm vegetarian I unfortunately do not have a lot to say about the bitterballen and haring. When I googled pictures, the first ones that came up were pretty representative, so I decided not to include incredibly long links to keep this comprehensive.

All these would make great single stamps as well. I just put 'set' because I wanted to recommend quite a few!