Technically, any toy that came with food was pretty great. But these were exceptional.
McDino Changeables (1991)
Oh, you thought you were just picking up some french fries? Oh no. It's a dinosaur ~disguised~ as french fries. Revolutionary, really.
Source: lakecountyhistory.blogspot.com
Tiny Toons Flip Cars (1991)
See, there was a character on EACH SIDE of the car. Genius. You flipped it over and everything... EVERYTHING... was different.
Source: ebay.com
Batman Car Figures (1992)
The batmobile toy was actually TWO pieces cause the front piece would THRUST off of the back piece so as to attack Batman's enemies.
Source: forums.superherohype.com
Potato Head Kids (1992)
Potato Head Kids let you dream the impossible. You could grow up to be a baseball player. Or a pirate. Or a potato.
Source: etsy.com