I was able to unlock this recipe today so here are the Podium Cake recipe details. This recipe is for the regular oven and it at the VERY END of the recipes listed, so you have to keep scrolling until you get to the end and find it. This recipe is now included in the Bakery Story Food Master List.
Takes 14 hours
Costs 1,440 Coins
Earns 6,000 Coins and 89 XP
This is what it looks like when the Podium Cake has finished cooking:
This is what the Podium Cake looks like when it is served up on the counter: