Creating this Overnight Eggs Benedict Casserole is straightforward. Follow these steps for the perfect brunch casserole:

1. Prepare the Casserole Dish: Grease a 9×13-inch baking dish or similar size with cooking spray or butter.
2. Layer the Bread: Evenly distribute the torn bread pieces in the bottom of the prepared dish.
3. Add the Ham: Sprinkle the diced ham over the bread layer.
4. Sprinkle Cheese and Onions: Evenly spread the shredded cheddar cheese and sliced green onions over the ham.
5. Mix the Egg Mixture: In a large bowl, whisk together the eggs, milk, heavy cream, Dijon mustard, salt, and pepper until well combined.
6. Pour the Mixture: Pour the egg mixture evenly over the bread, ham, cheese, and onions.
7. Cover and Chill: Cover the dish with plastic wrap and refrigerate overnight to allow the bread to soak up the egg mixture.
8. Preheat the Oven: The next morning, preheat your oven to 350°F (175°C).
9. Bake: Remove the dish from the fridge and let it sit at room temperature for 20 minutes. Bake in the preheated oven for 40-45 minutes, or until the top is golden brown and set in the middle.
10. Prepare the Hollandaise Sauce: In a small saucepan, whisk together the egg yolks and lemon juice over low heat until slightly thickened. Slowly whisk in the melted butter until smooth. Season with salt and pepper.
11. Serve: Once cooked, let the casserole cool slightly before serving. Drizzle with hollandaise sauce and garnish with chopped parsley.

Following these easy steps, you’ll create a stunning casserole that brightens any breakfast table!