I have lost the exact copy of this recipe so this written totally from memory.
Fill a 2-quart pan nearly full with water and a sprinkle or two of salt. Bring the water to a boil. Using a full crown of broccoli chop it up along with one medium sized onion. Add the broccoli and onion to the boiling water and cook till tender. Drain.
In a medium sized pan melt 3-4 Tablespoons butter and add 2-3 Tablespoons all purpose flour. Stir and allow the flour and butter to form a roux.
Add in 1 cup milk and stir constantly with wire whisk. Add a small brick of cream cheese. Stir mixture until cream cheese melts. Mix well. Combine cream cheese mixture with broccoli and onion and 1 cup shredded cheddar cheese. Mix till the shredded cheese melts.
Sprinkle the bottom of a casserole dish with ½ cup shredded cheddar cheese. Pour broccoli mixture over the cheese.
Place the casserole in a 350 degree oven until the mixture begins to bubble around the edges.