Sweet Serotonin is an Illinois micro-bakery specializing in cookies.

Deana Mrozowski runs Sweet Serotonin. To learn more, see the About page.

We currently have a wide selection of cookies, including the classics loved by most, deluxe versions with intricate blends of unique flavors, and the ever-changing rotational menu from our Cookie Lab! Not in the mood for cookies? We also sell Marshmallow Dreams and are continuously working on other creations.

Cookies and Marshmallow Dreams are our specialty. However, we have every intention of expanding into other confections and pastries. We’re experimenting with Brownies, Dog Treats, Gluten Free (GF)/Vegan/High-Protein flavors, and a not-so-ordinary approach that lets users create their cookies. Follow our socials to be the first to learn about that!

Please use our Custom Order form or message us directly via email or Instagram.

All orders have a 48 hour lead time and are fulfilled on Sunday and Monday unless otherwise agreed upon. In other words, We ship orders every Sunday and Monday and all orders must be in by end of the day Saturday (11:59 PM CST) unless we’ve personally discussed a different time with you (e.g. custom orders).

The Cookie Lab is a fancy name for our research and development efforts. We release two new cookie flavors monthly and create spontaneous creations for holidays or fun. Don’t want to miss a thing? Follow along!

We currently have email, Instagram, and Facebook, but we plan to create more avenues of communication to make it easier than ever to contact us.