Crockpot Chicken and Dumplings: Grandma's Hug in a Pot!

Ingredients

• 1.5 lbs (680g) boneless, skinless chicken thighs
• 1 tbsp (15ml) olive oil
• 1 medium yellow onion, chopped
• 2 carrots, peeled and chopped
• 2 celery stalks, chopped
• 2 cloves garlic, minced
• 4 cups (946ml) chicken broth, low sodium preferred
• 1 tsp dried thyme
• 1/2 tsp dried rosemary
• 1/4 tsp black pepper
• 1/2 tsp salt
• 1/2 cup (120ml) heavy cream (optional)
• 2 tablespoons cornstarch
• 1/4 cup cold water
• 1 1/2 cups (180g) all-purpose flour, plus more for dusting
• 1 1/2 tsp baking powder
• 6 tbsp (85g) cold unsalted butter, cut into small cubes
• 3/4 cup (180ml) milk