Add the chicken: Place chicken breasts or thighs in the bottom of your slow cooker in a single layer.
Build the sauce base: Pour in chicken broth.
Add cream cheese, heavy cream, parmesan, sun-dried tomatoes, garlic, Italian seasoning, onion powder, smoked paprika, salt, and pepper.
Don’t overthink the mixing: It’s fine if the cream cheese sits in small cubes. It will melt as it cooks.
Cook low and slow: Cover and cook on Low for 3.5–4.5 hours or on High for 2–3 hours, until the chicken is tender and reaches 165°F internally. Avoid lifting the lid too often.
Shred or slice: Remove the chicken to a cutting board.
Shred with two forks or slice into thick pieces.
Thicken if needed: Whisk 1 tablespoon cornstarch with 1 tablespoon cold water. Stir the slurry into the sauce and cook on High for 10–15 minutes until slightly thicker. This step is optional.
Add the greens: Stir in the spinach and cook for 2–3 minutes until wilted.
Combine and finish: Return the chicken to the slow cooker and coat in the sauce.
Taste and adjust salt and pepper.
Serve: Spoon over pasta, rice, mashed potatoes, or cauliflower mash. Garnish with fresh basil or parsley.