Lost my touch

How do you forget to add baking powder to a cake!?! Gawd, where has my Mo-Jo gone? I've plunged to the depths of bakery. Mija is 21 years old. You'd think I'd be able to manage a simple Golden Butter Cake with an eyes-closed-butter-cream....

I suspected something fishy when I opened the oven to check after 20 minutes and the cakes deflated like bad tires. While a normal cake is something like three inches high, these came out measured in centimeters.

All is lost...