Marcella Hazan's Cavolfiore Gratinato con la Balsamella

This adaptation comes from Marcella Hazan’s More Classic Italian Cooking. The recipe is supposedly one that editor Judith Jones wanted cut from the book. It turned out delicious and creamy, and proved relatively simple to make and a delicious vegetable side.
Ingredients
1 Cauliflower (yellow)
1.5-2 cups Béchamel sauce
3/4 cup of grated Parmesan cheese
1 tablespoons butter
Instructions
Quarter the cauliflower
Boil water
Cook cauliflower for about 4 minutes
Drain
Allow to cool
Makee Béchamel sauce
As sauce thickens, add 1/2 cup Parmesan cheese until melted
Cut cauliflower into bite-sized pieces
Combine cauliflower and sauce
Grease baking dish with butter
Fill baking dish
Top with remaining Parmesan Cheese
Add chunks of remaining butter
Baked at 400F