Combine the chicken breast, chicken broth, onion, garlic, salt, black pepper, dried parsley, dried sage, and bay leaf in your slow cooker.
Cook on LOW for 7 hours.
Remove the bay leaf and discard.
Remove the chicken and shred with a fork. Return chicken to crock pot.
Add in the frozen mixed vegetables.
In a medium bowl, whisk together the heavy cream and flour until fully combined.
Mix the cream mixture into the soup until fully combined.
Cover and cook on LOW for 1 more hour.
Top with Biscuits and enjoy.