Grease the inside of a 9-inch x 13-inch baking dish.
Spread half of the Canadian bacon and bacon on the bottom of the dish. Layer the English muffin pieces on top of the meats.
In a medium bowl, whisk the eggs, milk, and salt together. Pour over the English muffins.
Spread the remaining meats over the top of the English muffins. Cover with foil and refrigerate overnight, about 8 hours.
Preheat oven to 375 degrees F.
Bake covered for 35 minutes. Remove the foil and bake an additional 10-15 minutes or until cooked through. Remove from oven.
Hollandaise Sauce
Melt butter in a small saucepan over medium heat or in the microwave.
Whip egg yolks in a blender.
VERY slowly add melted butter to the eggs while running the blender. The stream of butter should be the thickness of a piece of yarn.
Squeeze in lemon juice, making sure to not add seeds. Blend to combine. Season with salt and pepper to taste.*If the sauce is too thick add more lemon juice.
Cut casserole into slices, top with hollandaise sauce, and chopped chives. Serve warm.