Preheat the oven to 350. Prepare a 9x13 cake pan with baking spray.
Mix together the ingredients for your yellow cake mix per package instructions.
Using a butter knife, cut the apples in the fried apple slurry into smaller pieces - about 1 inch per piece.
Add in 1 ½ cups of fried apples, 1 teaspoon ground cinnamon and ½ teaspoon ground nutmeg
Pour into the prepared pan and bake per package instructions. At the designated time, check the cake. If it is still wobbly and loose in the center, bake for another 5 minutes. Keep checking in this manner until the middle is no longer wobbly and loose and when it only jiggles a little - it is done.
For the icing: Boil all of ingredients in a small saucepan for 3 minutes - set a timer. Stir vigorously for the full 3 minutes. Remove the pan from the stove and immediately submerge the bottom half of the pan in an ice bath. Stir the icing until it is thickened and you are able to spread it over the cake.
Notes
This cake is slightly heavier than a box cake. So, if yours turns out that, no worries! That is the way it should be!