Getting her to eat anything other than pancakes, Ramen noodles, or peanut butter and honey sandwiches is a struggle to the death.
So I usually don't make a fuss over it. Picking my battles, ya know?
Besides, my little brother pretty much only ate peanut butter and jelly sandwiches from ages 3-7 and now he is a perfectly well-adjusted healthy food eating adult.
So fingers crossed that she'll look back at this and laugh at her hissy fits over mashed potatoes.
Until then, cake bribery seems to be working just fine.