Mac N' Cheese = Amazingness

Homemade mac n' cheese is possibly one of the most delicious things ever. It is one of the foods that is just so comforting. For a lack of a better explanation, it wraps you up in a blanket of comfort. It is just that amazing. Anyways, I made it for lunch today. I just kind of made up the recipe as I went.
Here it is as follows the best I can remember.

-Sauce-
2 TBS butter
1/2 onion, finely chopped
pinch salt and pepper 
1 large clove of garlic, finely chopped
1 tsp mustard powder
1 tsp paprika
1/4 tsp chili flakes
1/2 tsp seasoning salt 
2 TBS flour
1 cup skim milk
1/2 cup half-and-half 
1/2 water (I ran out of milk and cream, and needed something to stretch the sauce) 
2 tsp lemon juice
1 cup grated cheddar cheese + 3/4 cup
1 cup grated montary jack cheese


4 1/2 cups rotini 

I put the pasta in boiling salted water, and let the pasta cook while I made the sauce.

I also preheated the oven to 375F

Sauce....
I melted the butter, and added the onions and garlic. Then  I added the spices, salt, and pepper. Then I made a roux. I did this by slowly adding the flour to the butter and onion mixture. Then I added the  milk and cream and whisked until there was no lumps. Then I added the water, to make the sauce go further. Then I added everything else (minus the 3/4 cup of cheddar) and kept whisking until a sauce was formed.
Then I mixed in the pasta with the sauce, and put it in a casserole dish. I sprinkled the rest of the cheese on top and put it in the oven for 20 minutes. I broiled for the last few minutes so the top got all bubbly.

Then I had super tasty mac n' cheese, it was amazing!!!!! :)