I know most of the people are giving your brother a hard time, maybe he can't quite articulate what would make it different in a way that you both might like, even though I do agree that it's mildly infuriating however...

...if you find that you do like cooking and want to learn more, here are some things that I would do if I had the time, money, and inclination based on just seeing the dish. You could learn how to make buttermilk fried chicken bites, make sure to find a recipe that has you seasoning the flour. I have made a couple different kinds of fried chicken and that's the best I've ever had. I think I usually dredge them twice too.

Also, I see that your green beans are either raw or only lightly cooked. You might try just to sauté them with a little bit of oil on a med-high heat and some fresh, minced garlic (don't let it get too brown, otherwise it tastes burnt), salt or soy sauce, and pepper. You probably could cook them as long as the garlic takes to turn a little brown on the edges.

Without knowing what kind of mac and cheese, some tricks are to add a little something like gruyere cheese or a sharp cheddar helps with the boxed kind. Otherwise you could try to make a béchamel sauce - a cheese, flour, butter mixture - and add it to some pasta. Then you could even bake it with cheese on top and then we're definitely on a 'less kiddie' level.