2 cups milk
8 large eggs
3 stalks green onions, chopped
1 teaspoon onion powder
1/2 teaspoon dry mustard
1 teaspoon salt
¾ pound Canadian bacon, cut into 1/2-inch dice
6 English muffins, toasted and cut into 1/2-inch pieces
½ teaspoon ground paprika
For the sauce
1 cup milk
1 (.9 ounce) package Hollandaise sauce mix
¼ cup butter
Grease a 9×13-inch baking dish with cooking spray. Whisk together milk, eggs, green onions, onion powder, dry mustard and salt in a large bowl until well combined. Set aside. Layer 1/2 of the Canadian bacon in the prepared baking dish. Cover with English muffins. Top with remaining Canadian bacon, then pour egg mixture over everything. Cover the baking dish with plastic wrap and refrigerate, 8 hours to overnight. Preheat the oven to 375 degrees. Remove plastic wrap from the baking dish. Sprinkle casserole with paprika and cover the baking dish with aluminum foil. Bake in the preheated oven until eggs are nearly set, about 30 minutes. Remove the foil and continue baking until eggs are completely set, about 15 minutes more. When casserole is almost finished baking, make sauce: Whisk together remaining milk and Hollandaise sauce mix in a saucepan over medium heat. Add butter; cook, stirring frequently, until boiling. Reduce heat to medium-low and simmer, stirring constantly, until thickened, about 1 minute. Slice casserole into pieces. Drizzle warm sauce over each piece.