Step 1

Preheat oven to 350 F.

Step 2

In a large bowl, whisk together the eggs, milk, mustard, salt, pepper and nutmeg. Set aside.

Step 3

In a large cast-iron skillet, heat olive oil over medium heat. Add onions, salt and pepper and sauté for about 5 minutes, until softened. Add garlic and sauté for about 1 minute. Add broccoli and sauté for 10 minutes. Turn off heat.

Step 4

Add the bread and half the mozzarella to the pan and toss to evenly distribute the bread, cheese and broccoli. Pour egg mixture over everything and press it down with a spatula. Top with remaining mozzarella and Parmesan.

Step 5

Bake for about 40 minutes, until bubbly and golden. Let cool slightly before serving.