Line a baking sheet with parchment paper and drizzle with 2 tablespoons oil and 2 tablespoons sugar.
In a shallow dish, whisk together French toast batter ingredients. Dredge each slice of challah in mixture, letting the excess drip down. Place on prepared baking sheet (they should not be touching).
Drizzle challah with remaining oil and sugar and sprinkle with additional cinnamon.
Bake for 10 minutes, then flip and bake for an additional 10-12 minutes. Enjoy immediately! Maple syrup or confectioners’ sugar is optional.