I have two types of frosted brownies on my product list and I'm about to make my first 'go' at farmer's market selling. Note: I live in North Carolina and humidity/heat is killer! So I'm having trouble deciding how best to package these...can you advise?

They are frosted. And while I was going to sell in 4 packs...I'm hearing that individual items sell better??

Anyone have success with their brownie packaging?