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Boil chicken, cut into bite size cubes, and set aside.
Mix together sour cream, poppyseeds, cream of chicken, and cream of mushroom until blended.
Add cubed chicken to mix and blend together well.
Pour mix into baking dish.
Crush tube of Ritz crackers all over the top of the mix.
Drizzle melted butter all over the top of the crushed Ritz crackers.
Bake 20-25 minutes at 350*