Preheat the oven to 200 degrees Fahrenheit.
Using a serrated knife cut the panettone in half from top to bottom. Lay each half on its side and cut into approximately 1-inch thick slices. Set aside.
In a large bowl whisk together the eggs, milk, and Frangelico.
Pre-heat a griddle or frying pan over medium heat.
Melt 1 tablespoon of butter in the heated pan.
Working in small batches, dip the panettone slices into the custard, allowing both sides to absorb the custard. Cook the soaked panettone slices until golden brown and firm to the touch, about 4-5 minutes per side. Once cooked, transfer to a baking sheet and keep warm in the oven.
Repeat with the remaining panettone slices and butter.
Transfer the warm slices to a platter and serve, lightly dusted with confectioner’s sugar and drizzled with maple syrup.