Baked French Toast

Preparation Cut 12 (1-inch-thick) diagonal slices from bread, reserving ends for another use. Generously butter 1 side of each slice and arrange slices, buttered sides up, in 1 layer in a buttered 13- by 9- by 2-inch glass baking dish, squeezing them slightly to fit if necessary. Whisk together eggs, milk, and 1/4 teaspoon salt until combined well, then pour evenly over bread. Chill, covered, until bread has absorbed all of custard, at least 1 hour and up to 1 day, depending on bread. Preheat oven to 425°F. Bring mixture to room temperature and sprinkle bread with sugar. Bake, uncovered, in middle of oven until bread is puffed and top is golden, 20 to 25 minutes. Serve immediately.