In a large bowl whisk together the eggs, apple cider, half and half, maple syrup, vanilla extract, orange zest, salt, cinnamon, and ginger until smooth and well combined.
Cut the bread into 3/4 inch slices then line them up in the pan slightly overlapping them in the center.
Pour the custard mixture evenly over the bread slices and set aside.
Heat up a large skillet over medium high heat.
Add the butter and heat until it melts and turns foamy.
Add in the brown sugar, apple cider, cinnamon, and ginger and stir until well combined.
Add in the apples and stir to coat. Cook, stirring until the apples are softened, but still have a bite to them and the sauce has thickened, about 5-7 minutes.
Evenly spoon the warm apples and sauce over the top of the soaked bread, making sure to gently spoon some of the apples down in between the slices.
Cover with plastic wrap.
Refrigerate overnight, or for at least 6-8 hours.
Remove from the fridge 30 minutes before you plan to bake it to take the chill off it.
Preheat the oven to 350℉.
Cover with foil, and bake for 25 minutes.
Carefully uncover and continue baking for an an additional 20-25 minutes or until the center is cooked through and the bread is puffed and golden brown.
Let it cool for 5-10 minutes before cutting and serving.
Serve hot with your favorite toppings.
Notes
Apple cider: Fresh apple cider or shelf-stable apple cider will work.
Half-and-half: You could substitute whole milk for the half and half. Skim milk isn't rich enough for this recipe.
Maple syrup: Honey or brown sugar can be used in place of the maple syrup. If using honey, reduce the amount to 3 tablespoons as honey is sweeter than maple syrup.
Spices: You can substitute an equal amount of apple pie spice for the spices.
Brioche bread: You could substitute the brioche with another hearty bread like challah or Italian bread. Make sure the slices are on the thicker side. If the slices are too thin, they could fall apart.
Apples: Any firm baking apples such as Fuji, Pink Lady, Gala, Honeycrisp, or Granny Smith will work.
Salted butter: Or substitute unsalted butter + a pinch of salt.