I bake about 30 cup cakes for DD to take. Her kindy has up to 21 kids and 4 carers do I bake for that and a few extra. There are no egg or dairy intolerant kids in her class, so I just make sure it's nut free.
The class sings happy birthday and the teachers put one candle on the cupcake my daughter will be eating.
We're pretty healthy in this house, so it's always a low sugar, preservative free, homemade cake.