Grease baking dish with butter.
Layer cubed English muffins in dish.
Sprinkle Canadian bacon over muffins evenly.
Whisk eggs and milk together.
Add salt and pepper to mixture.
Pour egg mixture over muffins.
Cover dish with foil tightly.
Refrigerate overnight for best results.
Preheat oven to 375°F.
Bake covered for 30 minutes.
Remove foil and bake 15 minutes more.
Prepare hollandaise sauce according to package directions.
Drizzle sauce over hot casserole.
Garnish with fresh chives before serving.