Layer 1/3 bread, ham & cheese in buttered straight side baking dish.
Mix flour and mustard in a cup.
Sprinkle 1 T over layer; drizzle 1 T butter over layer.
Repeat layers to make 3 in all.
Beat eggs with milk and Tabasco until foamy.
Pour over other ingredients.
Cover and chill at least 4 hours or overnight.
Bake, uncovered, 1 hour or until puffed.
Serve at once.