Slice bread into 1 inch thick slices.
In a large bowl, combine all ingredients.
Whisk together thoroughly.
Pour into a large casserole dish.
Arrange bread in dish, pushing each piece down into the custard.
Let soak 8-10 minutes.
Flip over.
Let soak another 8-10 minutes.
While bread is soaking, heat griddle to 325℉/165℃.
Brush griddle with clarified butter.
Place toast on griddle and cook until browned, about 3-4 minutes.
Flip bread over and continue cooking until done, about 3-4 more minutes.
Repeat steps until all bread slices are used.