Slice French bread into 20 slices, 1 inch thick. Arrange slices In a generously buttered 9 x 13 pan in two rows, overlapping the slices. In a large bowl, combine the eggs, half and half, milk, sugar, vanilla, cinnamon, nutmeg and salt and beat with a rotary beater or whisk until blended, but not too bubbly. Pour mixture over the bread slices, making sure all are covered evenly with the milk mixture. Spoon some of the mixture between the slices. Cover with foil and refrigerate overnight.
The next day, preheat the oven to 350.
Combine all praline ingredients together in a medium bowl and blend well. Spread mixture over the bread and bake 40 minutes until puffed and lightly golden. Serve with maple syrup.