Season the chicken: Pat the chicken dry.
In a small bowl, mix salt, pepper, smoked paprika, garlic powder, onion powder, cumin, and chili powder. Rub the spice mix all over the chicken.
Sear for flavor (optional but recommended): Heat oil in a skillet over medium-high. Sear chicken 2–3 minutes per side until lightly browned.
This step boosts flavor but you can skip if short on time.
Make the sauce: In a bowl, whisk together sugar-free ketchup, apple cider vinegar, tomato paste, keto sweetener, Dijon, liquid smoke, and chicken broth until smooth.
Choose your cooking method: Add chicken and sauce to your cooker of choice: Slow cooker: Cook on Low 4–6 hours or High 2.5–3.5 hours.
Instant Pot: Pressure cook 10 minutes (thighs) or 12 minutes (breasts), natural release 10 minutes, then quick release.
Oven: Place in a covered Dutch oven at 325°F (165°C) for 60–80 minutes until easily shredded.
Shred the chicken: Transfer cooked chicken to a board and shred with two forks. If the sauce seems thin, simmer it uncovered for a few minutes to thicken.
Finish the sauce: Stir in butter for a silky texture (optional). Taste and adjust salt, vinegar, or sweetener to balance tang and sweetness.
Combine and serve: Return shredded chicken to the sauce and toss to coat.
Serve hot in lettuce cups, over cauliflower rice, or on low-carb buns or chaffles.