Chicken Pot Pie Casserole | Chopped

Ingredients

• 2 tablespoons unsalted butter
• 1 small yellow onion, diced
• 2 carrots, peeled and diced
• 2 celery stalks, diced
• 2 cloves garlic, minced
• 1/3 cup all-purpose flour
• 2 cups chicken broth
• 1 cup whole milk
• 3 cups cooked chicken, shredded or diced
• 1 cup frozen peas
• 1/2 teaspoon dried thyme
• 1/2 teaspoon salt
• 1/4 teaspoon black pepper
• 2 cups biscuit mix
• 2/3 cup milk
• 2 tablespoons unsalted butter, melted