Prep the slow cooker: Lightly grease the crock with a little olive oil or butter to prevent sticking and make cleanup easier.
Season the chicken: Pat the chicken dry and sprinkle both sides with salt, pepper, Italian seasoning, and onion powder.
This layers flavor right from the start.
Optional sear: For deeper flavor, quickly sear the chicken in a hot skillet with a little oil, 1–2 minutes per side. Not required, but it adds nice color.
Blend the sauce base: In a bowl, whisk together softened cream cheese, heavy cream, chicken broth, garlic, remaining Italian seasoning, and red pepper flakes. Stir in the Parmesan until mostly smooth.
Small cream cheese bits are fine; they’ll melt as it cooks.
Load the crockpot: Place the chicken in the slow cooker in an even layer. Pour the sauce over the top, spreading it to cover the chicken.
Cook low and slow: Cover and cook on Low for 4–5 hours or on High for 2.5–3 hours, until the chicken is very tender and reaches 165°F internally.
Shred or slice: Remove the chicken to a cutting board. Shred with two forks or slice into thick pieces, then return it to the crockpot and stir to coat with sauce.
Add greens: Stir in the chopped spinach.
Cover and let it wilt in the hot sauce for 5–10 minutes. Taste and adjust salt and pepper as needed.
Finish and serve: If the sauce seems too thick, splash in a little warm broth or cream. If too thin, leave the lid off for 10–15 minutes on High to reduce slightly.
Garnish with chopped parsley or basil.
Serve ideas: Spoon over cauliflower rice, mashed cauliflower, sautéed zucchini, roasted broccoli, or a bed of shirataki noodles for a full keto meal.