How to Make It
Lightly coat a 13- x 9-inch glass baking dish with cooking spray. Whisk together eggs, egg yolks, condensed milk, evaporated milk, vanilla, cinnamon, 3 1/2 cups of the half-and-half, and 3/4 teaspoon of the salt in a large bowl. Stir in bread cubes. Let stand at room temperature 1 hour, stirring once after 20 minutes and once after 40 minutes. Meanwhile, preheat oven to 325°F.
Pour bread mixture into prepared baking dish; cover with aluminum foil. Bake in preheated oven 25 minutes. Uncover; continue baking until custard is just set, about 20 minutes. Remove from oven; let stand 15 minutes.
Whisk together dulce de leche and remaining 1/4 cup half-and-half and 1/4 teaspoon salt in a medium-size microwavable bowl. Microwave on HIGH until warm and smooth, about 30 seconds. Drizzle warm sauce over bread pudding, or serve on the side.