Whisk together eggs, milk, salt, sugar, vanilla extract, and ground cinnamon in a flat-bottomed shallow baking dish. Place bread slices, one or two at a time, into the egg mixture and flip to make sure both sides of bread are well-coated.

Cook. Melt butter in a large skillet or on a griddle. Place bread slices in skillet or on griddle and cook on medium heat until golden brown on each side, about 2-3 minute

Serve. Serve immediately or keep warm in oven until ready to serve, but no longer than about 30 minutes.