This is a basic creamy cheese sauce. I made my mom some soft pretzels for her birthday, and cheese sauce is great for dipping. (To do pretzels, follow the directions in "Turkey Stuffed Soft Pretzel Rolls" but leave out the meat and form into a pretzel shape.)
2 Tbsp flour
1 cup milk
1/2 tsp salt
1/2 tsp Worchestershire sauce
1/8 tsp nutmeg
1/8 tsp paprika
1 tsp mustard (optional)
1/2 cup shredded cheddar cheese
Melt the butter in a pan, then wisk in the flour. Let this cook for 5 minutes, wisking frequently.
Gradually wisk in the milk. It may look clumpy at first...just keep wisking.
Mix in seasonings (don't add the cheese yet) and let this simmer for 10 minutes. Wisking frequently of course. After 10 minutes, it should look like this:
Turn off heat and wisk in cheese. Cheese sauce! Put it on potatoes, broccoli, nachos, pasta, anything you want.