Preheat oven 350°F. Cook chicken to your liking (bake, grill, boil). Cook rice and mix in soup and heat. Shred chicken into bite size pieces. In large sauce pan melt butter. When butter is melted crumble crackers into butter.
In baking pan (13x9) mix chicken, rice, and soup all together. Layer it on the bottom of your pan. On top of mixture layer your sour cream. Last layer, layer top with crackers and smooth out.
Bake for about 25 minutes or until toping is browned.