Batman dawnbreaker
First one to come to mind for me was Superman Annual #11 as well.
But since that’s been taken, I’d like to nominate “What’s So Funny About Truth, Justice and the American Way?” from Action #775. One of the handful of books I went out and bought extra copies of just so that I could give them out to friends when they ask why I like Superman so much.
Action Comics 775 - the Elite