Easy Cheesy Macaroni and Cheese

Yield:	6 Servings
Categories:

1 1/2	ts	Salt
4	c	Water
1 1/2	c	Uncooked macaroni
1/2	c	Shredded cheddar cheese
1/2	c	Shredded process cheese or Cheese Whiz
2		Eggs; beaten
2	c	Milk
1	ts	Finely chopped onion {optional}