Representative photography. Actual appearance may vary.
The Infatuation's current #1 smashburger in Chicago. A two-patty stack with American cheese, bearnaise, bacon jam, cherry peppers, Chubby Sauce, and crispy onions on a Martin's potato bun.
Representative photography. Actual appearance may vary.
Chubby Boys started as a viral breakfast sandwich pop-up before pivoting into a dedicated smashburger residency model. The current active burger operation runs from Spilt Milk Tavern in Logan Square on Wednesday through Saturday evenings.
The Chubby Smash layers bearnaise, bacon jam, cherry peppers, Chubby Sauce, and crispy onions over two smashed 80/20 patties with American cheese on a Martin's bun. Editorial reviewers repeatedly call out the unusual sauce stack as balanced rather than chaotic.
The Infatuation currently ranks Chubby Boys #1 on its Chicago smashburger guide, with additional inclusion across Chicago burger and pop-up lists.
Everything between the two potato buns gives each bite plenty of complex flavor - the bacon jam, bearnaise, cherry peppers, and crispy onions fuse into something that should be overwhelming but isn't.
#1 smashburger in Chicago - The Infatuation's highest smashburger designation in the market, held as of December 2025.
It's a true classic smash and further proof of how much of an impact the Maillard reaction has on a burger like this.
A perfect smash, well-seasoned, and fresh ingredients that take a basic burger to a whole new level.
#6 across all Chicago burgers and #1 among smashburgers specifically - featured in The Infatuation's best burgers and best pop-ups guides simultaneously.
Chubby Boys is a smashburger pop-up operating out of Spilt Milk Tavern in Logan Square - limited nights, no reservations, worth planning your week around.