In the 1963 edition of Joy, Marion recommends topping this casserole with a crust of crushed corn flakes and grated Romano cheese. We agree.
Preheat the oven to 425°F. Butter a 9-inch square baking dish. Prepare:
Drain, finely chop, and set aside. Melt in a medium saucepan:
Add and sauté until softened:
Stir in until blended:
Add while whisking constantly:
Bring to a simmer, whisking, until thickened. Remove from the heat and stir in:
Add the broccoli and stir to combine. Pour into the baking dish and top with:
Bake until bubbling around the edges and browned, about 20 minutes.