Meant to taste like banana cream pie, the frosted corn flakes are "naturally flavored with other natural flavors" according to the packaging.
Frosted Flakes previously came in banana flavor back in the '80s. That cereal featured bits of actual banana according to Mr. Breakfast.com.
If' you're having trouble finding Banana Creme Frosted Flakes cereal, Amazon.com has them in bulk (a pack of 10 boxes for $4.37 per 10.7-oz box), while Walmart.com offers a better price with a 2-pack of 24-oz Family Size boxes for $7.06 ($3.53 per box).
Photo via Kellogg's.