These cakes seem to be really popular, so I thought I'd show mine. If you like it, the pan is Wilton's Giant Cupcake pan, the recipe is:

Preheat oven to 325 degrees.
I Betty Crocker Chocolate Fudge Cake mix (or any flavor)
1 cup flour
1 cup sugar
1 small box Devil's Food instant pudding (or one that will compliment your cake flavor)
pinch of salt
Mix dry ingredients well. In another bowl, mix:
4 jumbo eggs (or 5 large)
1 cup sour cream
1 1/3 cup whole milk
1 cup butter, melted
Baker?s Joy Non-stick cooking spray!!
I used a marshmallow fondant recipe for decorating, which is at https://allrecipes.com/recipe/marshmallow-fondant/detail.aspx
Re: PIP: Giant Cupcake Bday
Here it is again so you can really see it:
Pinterest
That looks awesome!