My husband's favorite is eggplant parmesan. Just like chicken parm but breaded eggplant instead of chicken.
Another that I like to take eggplant and put through a flour, salt, pepper, onion flake and garlic powder mixture and fry up in cast iron skillet. Then I put either salsa on top or sprinkle with parmesan cheese. both quick and easy.
If you slice super thin (use a mandolin and watch your fingers) you can season the eggplant with whatever you'd like (we use a ranch flavored mixture you would for popcorn) and make chips in oven or deep fryer- good for dipping