About 24 hours before preparing this bread pudding: cut bread into 1/2 inch cubes and spread it out on a large baking sheet. Leave it out to get stale for about 24 hours.
To stale bread fast: Preheat the oven to 200°F. Cut the bread into cubes and spread them on a large rimmed baking sheet in one even layer. Place the baking sheet(s) into the oven. Let them harden for about 1.5–2 hours.
Apple Pie Filling:
Peel, core and dice apples.
In a mixing bowl, mix the apple cubes with flour, sugar, and apple pie spice.
Preheat a medium sauce pan, over medium heat, and melt butter. Once melted, add the apple mixture. Mix well and pour in the water.
Stir well and bring to simmer. Lower the heat to medium-low, cover with a lid, and cook until the apples are soft, stirring often. (10-15 minutes.)
Take off heat and strain through a strainer. Make sure to saving the juices! You will use the juices as a topping for the bread pudding.
Bread Pudding:
Preheat the oven to 375℉ and lightly grease a 9x13 casserole dish.
Spread stale bread in the baking dish evenly. Spread apples all over the bread evenly. Move it around a little to let some apples get between the bread.
In a large mixing bowl, whisk eggs, milk, melted butter, vanilla extract, 1/2 cup of brown sugar, apple pie spice, and cinnamon.
Pour egg mixture all over the bread and apples. Press down on bread lightly to ensure it's soaking up the egg mixture, and put in the oven.
Bake bread pudding for 30 minutes and then cover the top loosely with a sheet of aluminum foil. (This will prevent the top from darkening too fast.) Bake another 15-20 minutes until baked through.
Pull bread pudding out of the oven and pour saved juices from cooking apples all over the bread pudding. Let it sit for about 10 minutes to rest before cutting.
If you wish, serve bread pudding warm and with a scoop of vanilla ice cream on top.
Video
Notes
Apple Pie Spice: Apple pie spice is a blend of ground cinnamon, nutmeg, and allspice. You can buy this seasoning mixed at the store or make your own. (Simply combine 2 tablespoons of ground cinnamon with 2 teaspoons or ground nutmeg and 1 teaspoon of ground allspice. Mix it all together and store in a small glass jar with a lid.)
Storing: you can easily store bread pudding in the same dish you baked it in. Make sure to cover it air-tight with plastic wrap or use a baking dish that comes with a lid. Store it for 3-4 days in the refrigerator!
To reheat, simply cut off a slice and microwave just until heated through.