This always was a favorite of ours.
1 (1-pound) loaf panettone bread, crusts trimmed, bread cut into 1-inch cubes
8 large eggs
1 1/2 cups whipping cream
2 1/2 cups whole milk
1 1/4 cups light brown sugar
Lightly butter a 13 by 9 by 2-inch baking dish. Arrange the bread cubes in the prepared dish. In a large bowl, whisk the eggs, cream, milk, and sugar to blend. Pour the custard over the bread cubes, and press the bread cubes gently to submerge. Let stand for 30 minutes, occasionally pressing the bread cubes into the custard mixture.
Preheat the oven to 350 degrees F.
Bake until the pudding puffs and is set in the center, about 45 minutes.