Poppy Seed Chicken

2 1/2 to 3 lbs chicken cut in cubes
1 can cream of chicken
1 C. sour cream
1 1/2 stacks ritz crackers
1 cube butter
1 1/2 t. poppy seeds

Brown chicken then place in greased 9x13 pan. Mix sour cream and soup, pour over chicken. Sprinkle 1/2 tsp poppy seeds over chicken mixture. Melt butter and stir in crushed Ritz crackers. Add rest of the poppy seeds. Pour over chicken and sauce mixture. Bake @ 350 for 30 minutes. Serve with white rice.