Preheat your oven to 325°F (163°C). Cut the ciabatta bread into 1-inch cubes, place on a baking sheet, drizzle with olive oil and sprinkle with rosemary. Toss to coat and bake for about 15 minutes until lightly toasted.

In a mixing bowl, beat the eggs until blended. Add the half & half, salt, white pepper, and onion powder. Whisk until smooth.

Fold in the toasted ciabatta cubes and 1 cup of Parmesan cheese into the egg mixture. Mix until all pieces are coated. Let the mixture sit for 30 minutes.

Preheat your oven to 350°F (175°C). Grease a 9x11 baking dish with olive oil or butter.

Pour half of the bread mixture into the prepared baking dish and sprinkle ½ cup of Parmesan cheese on top.

Add the remaining half of the soaked bread mixture and top with the rest of the Parmesan cheese.

Bake uncovered for about 35 minutes until the top is golden brown and the center is set.