Magic Mix- premade white sauce

What is the key step in so many fantastic recipies?
WHITE SAUCE
So, when I found this little trick on Everyday Food Storage- I was pretty excited to try it out.
She calls it Magic Mix. I'll be honest- I havn't actually tried it yet but I made it today and I plan on using it with dinner tonight.
Ingredients:
2 1/3 cup powdered milk
1 cup all purpose flour (she says it has to be all purpose)
1 cup margarine or butter (2 sticks- NOT spread)

Now, on her site she said to have the butter at room temperature but I had some trouble with my mix being too soft . You should be able to just mix it up and it will end up being kind of a corn meal texture.

Mine turned into a dough instead so I put it back in the freezer for a little bit then threw it into my food processor to break it down to the powder.

I had some fun with it- I even modge-podged an empty baby cereal container to keep it in.

How cute!

Here's the finished product.

To make a white sauce you just use

2/3 cup of Magic Mix

1 cup water

Put it in a sauce pan and heat on medium while wisking briskly till it starts to bubble.

You can even freeze it or keep it in the fridge for 6 months.