You start by preheating your oven to 375 degrees Fahrenheit.
After you turn that on, get your butter and put it into a 9x13 inch pan and straight into the oven. The butter will melt in the pan as the oven preheats. (Be careful not to let it sit in the oven for too long after it has melted, otherwise it will burn.)
The next step is to trim your chicken. The chicken can be left in whole breast pieces, or tender size pieces, or cut up into bite-size pieces. I find that we like it best when the chicken is cut up into smaller chunks. (8-10 pieces per breast)
After the chicken is trimmed, get a large zip lock bag and add the flour and seasonings to it. Mix that together. Then once that is done, throw the chicken pieces into the bag and shake around.
Remove the baking dish from the oven. The butter should be melted and slightly browned.
Empty the floured chicken into the baking dish on an even layer.
Bake for 30 minutes, uncovered.
Meanwhile, chop your onion, measure your rice, and measure your chicken broth.
When the first 30 minute bake is up, remove the baking dish from the oven.
Using tongs, remove chicken pieces from pan and transfer them to another plate.
Pour the chicken broth, rice, and onion into the baking dish. Stir around. Set the chicken pieces on top of the broth and rice. Cover with aluminum foil. Put the baking dish back into the oven for another 30 minutes.
When the timer goes off, remove the aluminum foil from the baking pan. Put it back into the oven, uncovered for 15 minutes.
Remove from oven.
Serve immediately.