Preheat your oven to 350.
Mix together all your dry cake ingredients and mix well.
Add your milk, eggs, sour cream, butter and vanilla. Mix with a hand mixer on medium. Set aside.
Peel and chop 5-6 apples into 1/2-inch pieces.
In a saucepan over medium heat, add butter for apple topping, brown sugar and maple syrup. Combine well.
Add in chopped apples (if you added them to the water bath, make sure they are well drained), cinnamon and nutmeg. Bring to a boil and then simmer for about 10 minutes.
Grease a 9-inch round cake pan with butter. I've found that butter works the best for this.
Add your apple mixture to the pan and make sure the apples cover the bottom of the pan and that they're relatively even.
Add the cake mixture slowly on top of this. Make sure that the cake mixture is even.
Add to the oven for 50 minutes. You can check with a toothpick when the time is up. If you think it needs more time you can give it another 5 minutes.
Remove from oven and let cool completely. You can see in the video I didn't let it cool for time's sake but if you have the time, do it.
Once cooled, take a knife and go around the cake to make sure the sides aren't sticking. This is very important.
Then, add a plate or cake stand to the top of the pan and flip it over.
Carefully remove the pan to reveal the cake.
For the homemade whipped cream, add all your ingredients together and use a hand mixed to blend them for about 10 minutes. You can also heat up the cake and top it off with ice cream!
Feel free to sprinkle a little more cinnamon on top of that. :)