Burger King chicken nuggets from the 90s, before the recipe changed to crap. If I had to pick a flavor that I associate with my childhood, this would be it.
The Angus Mushroom & Swiss burger from McDonald's. The Angus was the closest thing they ever had to a real burger, but they were too expensive for most people and were eventually discontinued. Fun fact: wages have stagnated yet their basic burgers now cost more than the Angus did.