Grease a 6 quart crockpot with cooking spray. Set aside.
In a small bowl whisk cornstarch and heavy cream together until well combined.
Pour into prepared crockpot, then place chicken on top.
Sprinkle chicken breasts with ranch seasoning mix and pepper.
Top chicken with lemon juice, zest, garlic, and cubed cream cheese.
Cover and cook on LOW for 6-8 hours or HIGH for 3-4 hours.
Remove chicken from crockpot. Set aside.
Use a whisk to whisk together the cream sauce until smooth.
Cube chicken breasts, then stir back into the crockpot.
Taste and re-season, if necessary, then serve and enjoy!
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