Add chicken,onions, carrots, celery, potatoes, garlic, seasoning, chicken and chicken broth to slow cooker. Secure lid and cook on low for 6½ hours.
Remove chicken from crock and cut into bite-sized pieces. Return to crock.
Combine heavy cream and corn starch in bowl. Add to crock and stir to combine.
Toss quartered refrigerator biscuits in flour. Add to top of crock - do not stir in, you want them to stay on top. Re-secure lid and cook another 1½ hours.