Creamy low fat cheese dip. (Also gluten free)

My son loves his cheese dip. With Fritos, hot dogs, on french fries or on a spoon. On just about anything.
The problem being I hate processed cheese. I hate him eating processed cheese.
We searched high and low for a creamy cheese dip that wasn't spicy.
Nothing worked. Either they were lumpy or too spicy or just plain nasty.
Do yourself a favor and grate your own cheese. It tastes better and it is cheaper too. Plus that bagged shredded crap has a coating that messes with the creaminess.

8oz sharp cheddar cheese. Grated
8oz low fat milk
1 t hot sauce
1/2 t dry mustard
2 1/2 t corn starch
1/4 salt

More to come later