Papita, flan

Papita literally means "small potato", and flan is a delicious type of custard deeply loved by Mexicans.  When properly prepared, both potatoes and flan are tender and easy to eat voraciously, without even needing to chew. When something is said to be papita or flan, that something does not pose a challenge. It is "a piece of cake".

Example:

Felipe: Al chile, ser un verdadero líder no es de enchílame otra. Es un reto súper grueso.
Vicente: Bájale. Mi señora me dice que está bien papita.  

Felipe: Straight up, being a true leader is not something easy. It is an overwhelming challenge.
Vicente: Bring it down. My lady said it's a piece of cake.