Grease a 9×13-inch baking dish and arrange bread cubes evenly.
In a large bowl, whisk together eggs, milk, cream, maple syrup, vanilla, cinnamon, nutmeg, and salt.
Pour the egg mixture over the bread, making sure all pieces are coated.
Cover and refrigerate for at least 2 hours or overnight.
When ready to bake, preheat oven to 350°F (175°C).
For the caramelized apples: Melt butter in a skillet over medium heat.
Add apple slices, brown sugar, and cinnamon. Cook for 8-10 minutes until apples are tender and caramelized.
Spread the apple mixture over the soaked bread.
Bake for 45-50 minutes until puffed and golden.
Bake for 45-50 minutes until puffed and golden.