Melt margarine in a saucepan.
Add flour, salt, pepper, bay leaf, parsley, and onion; stir to blend.
Slowly add the milk.
Cook and stir until thickened; remove the bay leaf.
Stir in the cheese; remove pan from heat.
Arrange 6 custard cups on a baking pan.
Pour 1 T. (15 mL) of the sauce into each cup; break an egg over the sauce.
Cover egg with an additional 2 T. (30 mL) of the sauce.
Bake at 350°F (175°C) for 15 to 20 minutes or until eggs are firm but not hard.