In a large baking dish, combine chopped onion, carrots, celery, wild rice, and chicken broth. Cover with aluminum foil and bake for 1 hour and 15 minutes.
In a saucepan, melt 4 tablespoons of butter over medium heat. Stir in flour, salt, and poultry seasoning to form a roux.
Gradually whisk in milk until smooth. Continue stirring for 5-7 minutes until the sauce thickens.
After 1 hour and 15 minutes, remove the baking dish from the oven, add raw chicken pieces, and pour the creamy sauce over everything. Mix well.
Melt the remaining 6 tablespoons of butter and toss with cubed bread. Spread the buttered bread cubes evenly over the top.
Increase the oven temperature to 450°F (230°C) and bake uncovered for 20-30 minutes until golden brown.
Allow the casserole to cool for a few minutes before serving.
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Notes
Store leftovers in an airtight container in the refrigerator for up to 3-4 days. Reheat gently in the oven or microwave.