1. Melt butter in a saucepan, and stir fry mushrooms, 3-5 minutes.
2. Blend in flour. Gradually stir in milk and heat, stirring constantly until thickened and smooth.
3. Add seasonings and cook an additional 5 minutes over low heat, stirring occasionally.
Preheat oven to 375 degrees.
1. Grease or oil a casserole dish.
2. Layer half the chicken, half the cheese and half the mushroom sauce...followed by an additional layer of all three, ending with the mushroom sauce.
3. Top with breadcrumbs, then sprinkle with onion powder and poultry seasoning. Dot with melted canola margarine or butter. 4. Bake at 375 degrees for 45 minutes.