In a large skillet, sauté onion until soft (about 5 minutes). Add the ground chicken, celery and carrots and cook until meat begins to brown (about 4-5 minutes).: As the onion hits the hot skillet you should hear a gentle sizzle and smell an initial sharpness that softens into sweetness, signaling the Maillard reactions starting to happen. Cook over medium heat until translucent and fragrant, which usually takes close to five minutes, and you will know they are ready when they glisten and the raw edge has faded. This step matters because those browned sugars layer complexity into the final chili, and skipping it leaves the base flatter. A common mistake is turning the heat too high, which can scorch the onion and create bitterness, so keep the heat moderate and stir frequently to encourage even color.
Remove the meat and vegetables from the pan and transfer into the slow cooker. Add tomatoes, beans, spices, salt and pepper.: When you add the ground chicken , it should sizzle against the pan and release a savory aroma; break it up so it browns in small pieces and develops a toasty scent rather than steaming. The celery and carrots will start to soften and mingle their vegetal scents with the meat, and you will see the chicken change from pink to opaque with some golden bits forming. Browning is crucial because those caramelized surfaces contribute depth; if you crowd the pan the meat will steam instead of brown, yielding a less flavorful base. Watch for excess moisture, and use a spatula to scrape up any fond, those browned bits are flavor gold for the slow cooker.
Pour in chicken broth and hot sauce and stir.: After you transfer the sautéed mixture, notice the skillet will often have flavorful browned residue and a concentrated aroma left behind, that fond contains concentrated taste you can loosen with a splash of broth if needed. Putting the browned chicken , softened onion , and softened vegetables into the slow cooker ensures those flavors infuse the entire pot as it cooks. This matters because slow cooking magnifies the flavors you build early on, so do not skip this order. A mistake I see is leaving the fond stuck to the pan, which wastes flavor; scrape it with a spatula so everything goes into the cooker.
Set slow cooker to low, cover and cook for 5-6 hours.: When the fire roasted diced tomatoes and white beans join the pot, you will see a bright red and creamy contrast, and the aroma shifts to a tangy, savory layer. Sprinkle in the chili powder , cumin , salt , and pepper , and give it a careful stir so the spices distribute evenly. This step is where the flavor profile is defined, and gentle mixing prevents pockets of concentrated seasoning. Avoid over seasoning at this stage; taste later and adjust because canned ingredients can vary in salt content and you want to avoid overpowering the balance.
Pour in chicken broth and hot sauce and stir: Adding the chicken broth and the buffalo wing sauce transforms the pot into a simmering medium that will carry all flavors during the long cook. You should see the liquid come up to just cover the solids, and the mixture will hiss softly as it settles. The broth dilutes and distributes the buffalo wing sauce so the heat becomes integrated rather than isolated, producing a consistent tang throughout. A common pitfall is adding too much liquid, which can make the chili thin; measure to keep the texture hearty.
Set slow cooker to low, cover and cook for 5-6 hours: As the slow cooker warms, the aromas will grow richer, and you may notice gentle bubbling and steam from the lid. The long, low heat allows connective flavors to marry, softening the carrots and celery while the white beans thicken the broth, resulting in a comforting, cohesive chili. This duration matters because it mellows the sharpness of the sauce and coaxes deep, rounded notes from the spices. Avoid lifting the lid too often, as heat loss extends the cooking time; check only toward the end to confirm texture and seasoning.