Easy Cheesy Turkey Casserole Thanksgiving Leftovers

Ingredients

• 2 tablespoons (30ml) unsalted butter
• 1 medium yellow onion, finely chopped (about 1 cup / 150g)
• 2 stalks celery, finely chopped (about 1 cup / 100g)
• 1/2 cup (60g) all-purpose flour
• 3 cups (710ml) chicken broth, low sodium preferred
• 1 cup (240ml) whole milk
• 1 teaspoon dried thyme
• 1/2 teaspoon salt, or to taste
• 1/4 teaspoon black pepper, or to taste
• 3 cups (450g) cooked turkey, shredded or cubed
• 1 cup (150g) frozen peas, thawed
• 1 cup (150g) frozen carrots, thawed
• 1 1/2 cups (170g) shredded cheddar cheese
• 1/2 cup (50g) grated Parmesan cheese
• 1 cup (120g) crushed Ritz crackers (about 30 crackers)
• 4 tablespoons (60ml) unsalted butter, melted