Casserole recipe for my oldest child

I developed this recipe over a couple of years. I started trying to use condensed cream of chicken soup to save time, but the color and taste just didn't appeal to me. I started with the macaroni and cheese recipe in Dad's Own Cookbook, and worked from there. 

for the sauce:

6 tablespoons butter

6 table spoons all purpose flour

1 teaspoon salt 

1/2 teaspoon pepper

1 table spoon of whatever seasoning mix is on hand

2 cups milk (i use whole milk, lower fat content will take longer to thicken but it is possible)

1 cup chicken water (usually I boil chicken to go in this and use the water, or the chicken cubes mixed with one cup boiling water, or just boiling water, or if you're not using full fat milk another cup of that)

if it looks like enough cheese throw in some more, then throw some on the floor for Dewey and pretend like it's an accident. 

The rest:

2 cups of rice, this is the pre cooked measurement, 4 cups of water, b2b and cook for 20 minutes. the ratio of rice and water is probably one of the few things my dad taught me, let him have this tiny legacy.

Chicken- don't use the canned stuff, it's mostly water, I've actually measured, and it taste awful. I usually boil two chicken breast, or use an equal amount of the prepackaged shredded chicken. 

if you want to add bread crumbs to the top coat them in oil so they don't burn

preheat to 425. 

melt the butter on low (don't burn it. like seriously, if it's burned you have to start over, also the vegetable oil spread CAN be used, but it ends up being runny and the whole casserole is a lot greasier, but in a pinch it will do.) whisk in (I swear to fuck if you try to use a spoon I will end you) whisk in the flour and turn the heat up to maybe, MAYBE, 4, DON'T BURN IT. let it thicken, if you think it's thick enough, let it go some more. Then add the seasoning, salt and pepper, mix that in and add one of the cups of milk, let that thicken. had the second, repeat add third, repeat. Melt the cheese in it. Mix in the rice and cheese, spread in a 9 X 13 pan cover in cheese and bake for um 20 minutes I think? It's all cooked already so whatever is fine.