Two national chains have launched chef-in-residency programs in recent weeks — Habit Burger & Grill in July and Sweetgreen this week — extending a format long associated with fine dining into fast-casual kitchens that operate on single-digit check averages.

The mechanics differ. Habit, a California-based chain, opened its Habit & Co. platform in July with James Beard Award-nominated chef Jet Tila. His eight-week Korean Street Menu, featuring Crispy Rice Korean Salad and Korean Fried Chicken Bites, ran system-wide. Los Angeles Dodgers pitcher Alex Vesia followed with a second eight-week "Double Play" residency that introduced a proprietary Strikeout Sauce and remains available across the chain. A third installment is slated for the coming weeks.

What is Sweetgreen putting on the menu?

Sweetgreen, the fast-casual salad chain, named cookbook author Molly Baz as its first chef in residence under a "Lunch Means Business" campaign. Three limited-time items anchor the partnership: Molly's Big Dill Caesar Wrap, Molly's Pickle Caesar Salad, and Molly's Double Chick Scoop. Both chains have signaled additional residencies are coming.

Who counts as a "culturally relevant collaborator"?

Habit describes Vesia — a left-handed relief pitcher, not a cook — as a "top-tier culturally relevant collaborator," according to the company, placing athletes, musicians and influencers alongside credentialed chefs on its innovation roster. Tila and Baz, by contrast, bring culinary credibility through cookbook platforms and James Beard recognition.

Past chain collaborations fit the same template as Vesia's run: Chipotle's Salish Matter-linked Mr. Fantasy Burrito, Taco Bell's Olivia Rodrigo-tied You Seem Pretty Pink for a Baja Blast, and Popeyes' Megan Thee Stallion-tied Hottie Sauce. The throughline is a limited-time SKU built around a personality rather than a cuisine.

What is the operator case?

Restaurant traffic fell 3.5% year-over-year last month, according to Revenue Management Solutions, and operators have responded with trimmed marketing calendars and a renewed focus on food quality. Burger King, McDonald's, Chili's and BJ's have all pushed product upgrades in recent quarters, signaling that consumers are demanding more from each visit.

A residency collapses marketing and menu work into one limited-time window. A credentialed chef contributes sourcing, technique and a culinary point of view that operators can fold into menu engineering and cost-of-goods modeling. A celebrity or athlete contributes attention and cultural reach at a fraction of the price of a traditional media buy. Both routes give chains a controlled test bed: an eight-week run caps food-cost exposure on experimental SKUs and creates urgency without permanent menu bloat — a meaningful lever as labor and ingredient costs remain elevated.

For Habit, Vesia's run overlaps the Major League Baseball playoffs, giving the brand a topical hook tied to the Dodgers and a regional California identity. For Sweetgreen, Baz's cookbook audience offers trial-driving at a moment when salad chains have struggled to lift average check and repeat frequency.

What does the shift signal next?

Tila and Baz bring culinary credibility at a moment when the value gap between fast casual and quick service is narrowing. Vesia and similar figures bring attention economics. Both point toward residencies becoming a recurring slot on chain marketing calendars — a way to refresh menu boards, trial new proteins or sauces, and convert social conversation into traffic without permanently expanding the menu.

Expect more chains to copy the format, with bookings weighted toward whichever talent pool can move both ticket count and check average during a stretch when neither comes easily.