Grand Marnier French Toast

I've received rave reviews whenever I've served this.  I described the dish to my husband and told him how I'd passed the recipe to my niece when she married.  I wonder if it's become a tradition or family favorite in HER home? 
Grand Marnier French Toast

6 eggs
2/3 C orange juice
1/3 C Grand Marnier
1/3 C milk
3 Tbsp. sugar
1/4 tsp. vanilla
1/4 tsp. salt
Finely grated peel of 1 orange
8 (3/4 inch thick) slices French Bread
3-4 Tbsp. butter
Powdered sugar * (Optional, but come on, it's prettier at the end, with it)
Butter
Maple Syrup

Beat eggs in large bowl.  Add orange juice, Grand Marnier, milk, sugar, vanilla, salt and peel and mix well.  Dip bread into egg mixture, turning to coat all surfaces.  Transfer to baking dish in single layer.  Pour any remaining egg mixture over top; cover and refrigerate overnight, turning occasionally (liquid will be absorbed). 
Melt butter in large skillet over medium-high heat.  Add bread slices in batches and cook until browned, about 8 minutes.  Cut bread diagonally.  Arrange on platter and sprinkle with powdered sugar.  Serve immediately.  Pass butter and maple syrup.