Cake is a common item in the Mario series. It is mentioned several times in the SMG4 universe, but actually isn't physically shown in the bloopers it's mentioned.
In SMG4's bloopersEditPeach sends a letter to Mario saying that she has cake. But the cake isn't there and, according to Toad, was just a lie. This sent Mario mad and threw Peach away upon seeing her.
This blooper is a remake of The Cake Is A Lie!, so the info of cake's appearance in The Lie that was the Cake that is a Lie is mostly the same as The Cake Is A Lie!.
Cake is mentioned in this blooper, when Peach says to the guy, "Let's make a delicious cake...for Mario."
This food is also mentioned in 99% beroken, the same way as in Ssenmodnar 3, except Mario interrupts Peach before she says "...for Mario".