Everyone saying Open Fields and hit their feet, and they're 3 tall you're 2 tall, do the math, etc etc, let me present my ender pearl hut.
No pictures right now because computer must charge(yay laptop and non-standard charger that can't hit the needed amperage!), but here's the idea: Make a hut. Make sure it is either accessed from below like a tower but is flush with the ground, or make sure the doors are zombie proof. Next, add windows along the sides to strike through, but make sure one can defend against skeletons and/or creepers as well. Then, staredown a enderman when you see him, look away, and wait. He'll find his way over to you, then just kill him. Add a loot collection system on the walls if needed, and bobs you're uncle, a vanilla style enderman killing room on the overworld!
I've been working on vanilla style mob killing since I realized they are all very early game.
and here I am just hiding under 4 block tall trees