Non Dairy Melty Cheese

1 cup nutritional yeast flakes
1/3 cup white flour (I use whole wheat)
3 tablespoons cornstarch
1 1/2 teaspoons salt
2 cups water
1/3 cup margarine (I always use 1/4 cup olive or other cold pressed oil instead of margarine)

Mix dry ingredients in a saucepan. Gradually add water, making a smooth paste and then thin with the remaining water. Place on heat and stir constantly until it thickens and bubbles. Let it bubble up for about 30 seconds and remove from heat. Whip in the margarine or oil.
Good on pizza, casseroles, open-faced tomato sandwiches, grilled cheese sandwiches, macaroni and cheese, and enchiladas.