Season the chicken. Pat the chicken dry. Mix salt, pepper, garlic powder, onion powder, and smoked paprika.
Rub the seasoning all over the chicken.
Layer the base. Add chicken broth to the bottom of the slow cooker. Place the chicken on top in a single layer when possible.
Add the creamy elements. Scatter the cream cheese chunks over the chicken. Sprinkle in the chopped jalapeños.
Dot with butter if using.
Cook low and slow. Cover and cook on Low for 4–5 hours or High for 2.5–3 hours, until the chicken is cooked through and shreds easily.
Shred and cheese. Shred the chicken right in the crockpot using two forks. Stir well to combine with the melted cream cheese and jalapeños. Add 3/4 cup of the shredded cheddar and mix until smooth and creamy.
Adjust the sauce. If you want it richer or silkier, stir in the heavy cream.
If it’s too thick, add a splash of broth to loosen.
Finish and melt. Sprinkle the remaining cheddar over the top. Cover for 5–10 minutes to melt.
Garnish and serve. Top with chopped cilantro or green onion. Squeeze a little lime over each serving for brightness.