Spray a 9x13-inch baking dish with nonstick cooking spray.
Cut bread into 1-inch thick cubes and arrange in the prepared dish.
In a large bowl, whisk together eggs, milk, maple syrup, vanilla, cinnamon, and salt until well combined.
Pour the egg mixture evenly over the bread cubes.
In a separate bowl, combine melted butter, brown sugar, and maple syrup. Spread this mixture over the bread layer.
Sprinkle chopped pecans evenly over the top.
Cover with foil and refrigerate overnight (at least 8 hours).
In the morning, preheat oven to 350°F.
Bake covered for 30 minutes, then uncover and bake for additional 15-25 minutes until golden brown and set.