In the bottom of a slow cooker, arrange the chicken thighs in a single layer (as best you can). Sprinkle the chicken with the salt, Italian seasoning, smoked paprika, garlic powder, black pepper, and red pepper flakes.
In a medium bowl, whisk together the heavy cream, parmesan, sun-dried tomatoes, garlic, and cornstarch until smooth. Pour the mixture all over the chicken thighs.
Place the lid on the crock pot, and cook on HIGH for 3-4 hours or on LOW for 5-6 hours. It's ready when the chicken has an internal temperature of 165 degrees F and the sauce has thickened.
Stir in the spinach and cook it in the sauce for 10 minutes, until wilted. Add water to the sauce as needed to reach your desired consistency.
Serve the chicken over cooked pasta, rice, or potatoes and veggies with extra sauce spooned over the top.
Notes
Nutritional information is for 2 thighs and 1/4 of the sauce per serving.