Take your Italian bread and cut it into cubes. Make sure the cubes are about one inch large. Place them in the bottom of the dish.

Crack the ten eggs into a large bowl. Whisk them until the yolks and whites mix. Add the milk or cream to the eggs.

Add the salt and the black pepper now. Stir in the melted butter and the scallions. This adds a lot of flavor to the base.

Put the Gruyère and Parmesan into the egg bowl. Mix them gently so the cheese spreads out well. The cheese makes the dish very rich.

Pour the egg mixture over the bread cubes. Use a spatula to push the bread down. Every piece of bread should be very wet.

Cover the dish with a piece of foil. Put it in the fridge for one hour. This makes the casserole very light and fluffy.

Set your oven to 350 degrees Fahrenheit. Take the dish out of the fridge while heating. Remove the foil before you start baking.

Put the casserole in the hot oven. Bake for 45 to 50 minutes total. The center should be firm and not wiggly.