Place the cubed chicken, peas, corn, carrots, onion, and garlic in the slow cooker.
Pour in the chicken broth and sprinkle with thyme, salt, and pepper.
Cover and cook on low for 6-7 hours or on high for 3-4 hours.
In a small bowl, whisk together heavy cream and flour, then stir into the slow cooker.
Cover and cook for another 30 minutes until thickened.
Preheat the oven to 375°F. Bake the biscuit dough according to the package instructions.
Serve the creamy chicken pot pie mixture topped with warm biscuits.