1 cup milk
1/2 teaspoon vanilla extract
6 slices bread
2 tablespoons butter, plus more for serving
3 apples, peeled and sliced
2 tablespoons water
1/2 cup maple syrup
Whisk the eggs, milk, vanilla, and a pinch of ground cinnamon in a 9-by-13-inch baking dish. Add the bread in a single layer, turning until all the egg is absorbed.
Meanwhile, heat a large skillet over medium heat, melt 1 tablespoon butter, and add apples, stirring to coat until starting to caramelize. Add the water, cooking until water has evaporated and apples are tender, about 4 minutes.
Pour in the maple syrup and a dash of ground cinnamon; simmer for a minute to combine.
In a large, heated nonstick skillet, melt about 1 tablespoon butter and saute the soaked bread until golden brown on each side, about 4 minutes. Place French toast on a plate and top with apple-maple mixture.