In a shallow bowl beat together eggs, milk, sugar, vanilla, orange liqueur, and cinnamon. Place crushed cornflakes in another shallow bowl. Dip bread slices into egg mixture, turning to coat both sides (if using challah bread or brioche, let soak in egg mixture about 10 seconds on each side). Dip soaked bread in cornflakes, turning to coat both sides with flakes.
In a skillet or on a griddle melt 1 tablespoon of the butter over medium heat. Add half of the bread slices; cook for 4 to 6 minutes or until golden brown, turning once halfway through cooking time. Repeat with the remaining 1 tablespoon butter and the remaining bread slices. Serve warm. If desired, serve with syrup.