Generously grease 13x9x2 inch baking pan. Fill pan with bread slices to within 1/2 in of top. Blend together eggs, milk, half/half, vanilla, nutmeg and cinnamon. Pour over bread slices. Cover and refrigerate overnight. Combine topping ingredients and set aside until time to bake toast. Spread topping over toast. Bake at 350 degrees for 50 minutes until puffed and golden. If top browns too quickly cover with foil.