Saute onion and garlic in butter. Add flour and cook over low heat until the roux is cooked but not browned. Whisk in milk. Add bay leaves, nutmeg and white pepper. Simmer on low for ten minutes but do not boil. Whisk to prevent flour from sticking to bottom. Remove from heat and pour through a strainer to remove onions, garlic and bay leaves. Whisk in parmesan. Cool.

To Assemble the Croque Madame
Preheat oven broiler

Toast the sourdough bread. Spread the Mornay sauce
over the bread. Lay down the Canadian Bacon followed
by the bacon and the cheese. Place sandwich into the oven
broiler to melt the cheese. Meanwhile, in a non stick pan
crack the egg and cook until desired doneness.

Remove sandwich from broiler and top with egg.

Serve immediately.