This nine-card pack was issued and given out at various conventions and in orders during 2016, to commemorate Looney Labs' 20th birthday. It is a self-contained set, so it can be added to any Fluxx, though note that it does contain chocolate, which is redundant with unthemed "regular" versions, so just take the duplicate out.
It contains:
Keepers:
Chocolate
Cake
The Gift
Ice Cream
Goals:
Chocolate Cake
Hot Fudge Sundae
Free Ice Cream!
Happy Birthday!
Cake and Ice Cream