Early wake up if dinner is small, but won’t eat much unless mac&cheese: advice?

Sweet, 23 month old. If we give him mac and cheese for dinner, he’ll eat a ton and sleep until 7:15. If we give him other foods, even other ones he likes, and he eats okay, he sleeps until 6. If dinner is an experiment, and he doesn’t eat much (even though we supplement with other foods - yogurt, grapes, etc), he wakes at 5! If he just slept until 6:30, that would be magical.

Help me feed my kiddo more than just mac and cheese for dinner each night! I’m seriously considering it!