(SAUCE) 1. In a large saucepan, melt the butter. - Be careful not to overcook it, just melted is what we're looking for. 2. Add the flour to the butter, stirring constantly until it begins to bubble. - Whatever you do: DO NOT STOP STIRRING; or you'll be left with pancakes. 3. Remove the pan from the heat. 4. Slowly add the milk, stirring constantly. The best trick here is to pour a bit, mix fully, pour more, mix fully. 5. Return the pan to the heat - stirring until boiling. Keep the mixture at a steady boil for 2 minutes. (Keep stirring!). - Make sure it is not so hot that it is bubbling over. - The sauce should now be thick and creamy to stir. 6. Add ⅔'s of the cheese to the sauce and mix until fully melted. Now your creamy sauce is completed, take it off the heat!