In a large mixing bowl, whisk together the eggs, canned pumpkin, brown sugar, and maple syrup until well-combined. Add the spices, milk and heavy cream, then whisk again. Add the cubed bread and walnuts and toss together until the bread is well-coated in the custard mixture.
3 eggs, 1 15-ounce can pumpkin, ¾ cup brown sugar, 2 tablespoons maple syrup, 1 teaspoon ground cinnamon, ¼ teaspoon ground cloves, ¼ teaspoon ground ginger, 2 cups whole milk, ½ cup heavy cream, 4 cups stale bread, cut into ½ inch cubes (challah, brioche or other rich bread), 1 ½ cups walnuts, chopped