When my kids were those ages, I frequently used a cookbook called the Six O’Clock Scramble - hopefully it is still in print! The recipes were very simple, kid friendly and quick, and the author would always make a suggestion for a side - sometimes as simple as “raw carrot sticks and snap pea pods” which my brain appreciated at 6pm as I was usually fried
Two meals from it that I remember my kids loving (and that were so easy to prepare) were honey sesame noodles with edamame, and something called “chips olé” which was a riff on a dish from the mcps cafeterias (haha), basically taco meat that you scoop up with tortilla scooper chips, and I’d add spinach to the dish.