1. Tear bread into pieces or cut into cubes, 1-inch each. Arrange pieces in a generously buttered 9 by 13-inch flat baking dish.
2. In a large bowl, combine the eggs, half-and-half, milk, sugar, vanilla and Apple Pie Spice then whisk until blended but not too bubbly. Pour mixture over the bread, making sure all pieces are covered evenly with the milk-egg mixture. Cover with foil and refrigerate overnight.
3. The next day, preheat oven to 350 degrees.
4. Combine butter, brown sugar, and pecans in a bowl. Spread topping evenly over the bread and bake for 40 minutes, until puffed and lightly golden.