Butter a 9x 13 baking dish. Slice the whole loaf of French bread into 1-inch thick slices. Arrange slices, in the dish by overlapping them and in 2 rows.
In a large bowl, whisk together eggs, then whisk in the half-and-half, milk, sugar, vanilla, cinnamon, nutmeg and salt. Whisk until thoroughly blended.
Pour mixture evenly over the bread. Make sure each slice is coated with the egg and milk mixture. Cover the dish with foil and refrigerate overnight.
The next morning, preheat your oven to 350 degrees F.
Make the Praline Sauce:
2 sticks of butter, melted1 cup packed light brown sugar
1 cup chopped pecans
2 tablespoons light corn syrup
1/2 teaspoon ground cinnamon
1/2 teaspoon ground nutmeg
Whisk all of the ingredients, except the pecans together. Once thoroughly combined, fold in the pecans with a spatula.
Remove the baking dish from the refrigerator and pour sauce over the the bread. the sauce will be somewhat thick, so you may have to get a spoon and gently spoon the sauce to make sure it covers each slice of bread.
Bake at 350 degrees for 30 to 40 minutes. The bread will puff slightly and turn a pale golden color.