Chicken Pot Pie Casserole

Ingredients (30)

• For the chicken:
• 2 pounds boneless skinless chicken thighs
• 1 yellow onion quartered
• 3 garlic cloves
• 2 teaspoons kosher salt
• 1 teaspoon ground black pepper
• 1 cup water
• For the filling:
• 3 tablespoons butter
• 7 carrots sliced into rounds
• 1 large onion chopped
• 5 celery ribs sliced
• 1 teaspoon salt
• 1/2 teaspoon black pepper
• 2 teaspoons garlic powder
• 1 teaspoon dried thyme
• 2 teaspoons dried oregano
• 1/2 cup all purpose flour
• 2 cups chicken stock
• 2 cups half and half
• 6 ounces cream cheese softened at room temperature
• 1/2 cup sour cream
• 1 cup frozen peas
• 1/4 cup chopped fresh parsley
• For the biscuits:
• 1 cup unsalted butter
• 3 cups all-purpose flour
• 3 tablespoons baking powder
• 11/4 teaspoon salt
• 11/4 cups buttermilk divided