Preheat oven to 300 degrees F. Whisk the eggs in a medium bowl until well beaten. Add the milk, sugar, and cinnamon; mix well.
Combine the coconut and cornflakes in a shallow pan. Heat the butter in a large skillet over medium heat until bubbly. Dip 4 bread slices into the egg mixture, then coat with the coconut mixture. Place the bread slices in the pan and cook until golden brown, 2-3 minutes on each side. Keep warm in the oven on an ovenproof platter. Repeat with the remaining bread. Serve with warm maple syrup.