While you prep the other ingredients, preheat your oven to 350 degrees Fahrenheit. This ensures the dish starts cooking at the right temperature.
Take your 9x13 inch casserole dish and coat the bottom with butter. This helps prevent sticking and adds a bit of richness to the dish.
Add water, rice and onion soup mix. Stir to evenly distribute rice.
Place chicken in the rice mixture. The chicken should be about half way covered
Sprinkle boom boom over chicken and rice
Bake at 350 degrees for 1 hour
Let rest for 5 minutes before serving