I use a basic recipe similar to this.
https://www.bbcgoodfood.com/recipes/best-ever-macaroni-cheese-recipe
Which the offspring deign to eat.
How to make it a bit fancier without altering it too much? Can you shoehorn in veg somehow inside the mac and cheese (I serve it on the side but it's not always eaten)? Can you add bacon somehow? Herbs?