Season your chicken breasts with the garlic salt, italian seasoning, paprika and black pepper.
In a large skillet over medium high heat melt the butter.
Add the chicken to the skillet and sear briefly on each side, just to get some color on them.
Place the chicken breasts into the slow cooker.
Cover and cook on low 4-6 hours or high 4 hours.
Remove the chicken from the slow cooker.
Whisk together the water and cornstarch.
Whisk the cornstarch slurry into the slow cooker to thicken.
Whisk in the heavy cream.
Add the chicken back and spoon the sauce over the chicken breasts.
Serve!