Turn the slow cooker on high about 20 minutes before you start this recipe. When the slow cooker is really hot, place 1 1/2 Tablespoons of butter in the bottom of the slow cooker.
Cut the bread in one-inch cubes - you'll have 4 - 5 cups of bread cubes - set aside. Wash and peel the apples, and slice in about 1/4 inch thick slices.
Place the apple slices in a large bowl, and sprinkle with the granulated sugar, and stir.
Add the Apple pie filling, and cinnamon, and stir well. Add the condensed milk, heavy cream, Maple syrup, salt, and brown sugar, and stir well to completely blend all ingredients together.
In a small bowl, break the eggs, and beat with a fork or whisk until light lemon color, and fluffy. Add the eggs to the Apple mixture, and stir well. Check on butter in the slow cooker, it should be melted and sizzling.
Add the cubed bread to the slow cooker, and stir/toss the bread cubes in the butter to coat. Spread the bread cubes out in the bottom of the slow cooker, and allow them to sit in the bottom of the cooker for about 10 minutes, or until they're a little crunchy.
Pour the Apple mixture over the bread in the slow cooker, and spread out evenly over the bread. Slice the remaining butter in thin slices, and dot the top of the bread pudding with the slices. Sprinkle a little sugar on top of the butter, and place the lid on the slow cooker. Leave the slow cooker on high for about 45 minutes, then turn it on the low setting, and let the bread pudding cook for about 2 hours.
Check the bread pudding, and if all the apple pie filling has been absorbed, turn the pudding in the cooker, with a huge spoon, placing the top on the bottom of the slow cooker. This will allow the bread to become crunchy, and make sure all the Apple mixture is well cooked. Leave the bread pudding for 1 hour more, and then check again to make sure the bread pudding is browned, and a knife inserted in the center comes out clean - if it does not, leave the bread pudding in the slow cooker until a knife comes out clean.
When the bread pudding is done, you can serve it hot, or you can let it cool a bit, and place it in a covered container in the refrigerator. You can either serve it hot or cold. Serve with a scoop of ice cream, and drizzle thick caramel sauce over the top. Enjoy!