Preheat oven to 350°F. Butter a 9x13 inch dish.
Cube bread into 1-inch pieces, spread in dish.
Toast pecans in skillet 3–4 minutes until fragrant.
Sprinkle pecans over bread, reserve some for topping.
Whisk eggs in large bowl.
Add milk, cream, maple syrup, brown sugar; whisk smooth.
Stir in vanilla, cinnamon, nutmeg, salt.
Whisk in melted butter.
Pour custard over bread and pecans.
Press bread gently to soak. Rest 15–20 minutes.
Sprinkle reserved pecans on top.
Cover with foil, bake 35 minutes.
Remove foil, bake 15–20 more minutes until golden.
Cool 10 minutes before serving.