You can sell on Etsy. Read the rules and sign up. There is a $0.20 per item listing fee and then Etsy takes a percentage of the sale. You can also sell at Artfire.com It's a good, up-and-coming site for selling handcrafted items, but Artfire doesn't have the traffic that Etsy does. I sell hand-dyed yarn and wool for spinning on both sites.
Anyway. I haven't listed any baked items, but I am very tempted to. I have made some very good tasting gluten-free cookies. I just need to get better at decorating them before listing them for sell.
I, too, am interested in hearing how others are doing wtih sales on Etsy and other handcrafted selling sites.