Heat olive oil in a large skillet over medium-high heat for two minutes. Add your diced onion and minced garlic, stirring constantly for three minutes until fragrant and lightly browned—this builds flavor that raw aromatics simply cannot provide.
Transfer the softened onion and garlic to your slow cooker, then arrange chicken thighs on top in a single layer. Pour buffalo sauce, chicken broth, and melted butter directly over everything, then sprinkle smoked paprika and black pepper across the surface.
Cover and cook on low for eight hours—this is the critical timing because rushing it defeats the entire purpose. Set a phone reminder so you don't accidentally forget and overcook your beautiful slow cooker buffalo chicken recipe.
After eight hours, remove the lid carefully because steam will be intense. The chicken should shred with minimal resistance when you press a fork against it. If it doesn't, it needs another 30 minutes.
Mix cornstarch and water in a small bowl until completely dissolved, then pour the slurry slowly into the slow cooker while stirring constantly. This prevents lumping and creates that silky sauce texture you're actually after here.
Stir in shredded cheddar cheese until completely melted and incorporated, which takes about two minutes of consistent stirring. Taste the beautiful slow cooker buffalo chicken and adjust spice level by adding more hot sauce if you want heat, or more butter if you want richness.
Sprinkle fresh parsley over everything right before serving, which adds brightness and prevents the dish from tasting heavy. I learned this the hard way after Marco took one bite of a parsley-free version and politely asked me to "add something green."