Pour half the cake mix into the prepared baking tin, and spread it out to the corners.
Place the apple slices over the cake batter in neat rows, (keep a few aside to put on the top of the cake) then sprinkle the rest of the cinnamon over.
250 g apple, 2 teaspoon cinnamon
Smooth over the rest of the cake batter, being sure not to disturb the apple layer too much.
Add a few extra apple slices on top, and sprinkle over the extra brown sugar.
2 tablespoon extra light brown sugar
Pop in the oven and bake for 30-35 mins. Test with a skewer to see if it is cooked through. If it comes out clean, it's ready to take out of the oven. If it comes out a little gooey, leave the cake in for another 5 mins. The cooking time will really depend on how large your tin is, so if you use a smaller tin, adjust the time to be a little longer.
Cool the cake in it's tin for 10 mins, then turn out onto a cake rack.
Once cool, turn the cake onto a serving plate. Serve with icecream or cream, or a drizzle of caramel sauce.
Video
Notes
TOP TIPS:
Be sure to slice the apples thinly, otherwise you will end up with soggy patches in the cake.
The apples provide much of the moisture content so this needs to be quite a sticky cake batter rather than runny, so don't add in too much plant milk.
STORAGE:This cake keeps well for at least 5 days in an airtight container. Probably longer but it was gone before I could test it!