Spray the slow cooker liberally with non stick spray, or spread butter or oil on the bottom and sides of the slow cooker.
Cut the cinnamon rolls into six pieces each. Add to the slow cooker.
Add the diced apple to the cinnamon rolls and toss the cinnamon roll pieces and apples together to distribute evenly.
In a medium size bowl, add the melted butter, sugars, cinnamon and salt. Mix until combined. This will look like a caramel sauce.
Pour over the caramel sauce mixture evenly over the cinnamon roll pieces and apples.
Place the lid on the slow cooker and cook on HIGH for 1 hour and 45 minutes or until the cinnamon rolls are set in the middle.
Notes
Store any remaining casserole in an airtight container in the refrigerator. Reheat individual servings in the microwave for a quick fix, or warm larger portions in the oven at a low temperature to preserve the texture.
While the casserole is best enjoyed fresh, you can freeze leftovers in an airtight container. Reheat in the oven or microwave, and it should retain its deliciousness.
Tempted to use canned apple pie filling? Fresh apples are best for this recipe. They cook up perfectly with the cinnamon rolls and canned apple pie filling can tend to be overly sweet.