Simple Chicken Stew

Ingredients

• 1 tablespoon oil
• 1 tablespoon butter
• 1 cup white pearl onions or 1 Spanish onion, chopped
• 3 celery ribs, cut in 1/2 inch pieces
• 1 large garlic clove, minced
• 2 cups chicken broth
• 1 (28 ounce) can whole tomatoes, broken up
• 1 bay leaf
• 2 tablespoons fresh oregano or 1 12 teaspoons dried oregano
• 1 teaspoon sea salt
• 4 cups yukon gold potatoes, cut in large chunks
• 1 12 cups baby carrots
• 2 cups leftover chicken, chopped
• 1 12 tablespoons cornstarch
• 2 tablespoons water