Cut the panettone into vertical slices about ¾-1 inch thick- you will get about 5-6 slices. If necessary, cut the slices in half to fit in your pan.
In a shallow bowl, whisk together the eggs, half and half, vanilla, and orange zest until well combined.
Dip the panettone slices in the egg mixture for a few seconds on each side, allowing excess liquid to drip off. Do not over soak.
Heat a non-stick pan over medium heat.
Add about a tablespoon of butter to the pan.
When the butter begins to foam, add the panettone slices and cook until golden brown, about 2 minutes. Flip and repeat on the other side. Continue with the remaining slices, buttering the pan each time.
Finish off with desired toppings and serve immediately.
