I didn’t read the whole thread so sorry if I’m just repeating.
mashed potatoes, baked potatoes, french fries, blintzes (cheese, potatoe, mushroom…), farfel, burgers, sauteed vegetables, soup (chicken, vegetable…), knishes (potatoe, vegetable, mushroom,…) rice, corn on the cob, green beans, meat loaf, homemade pizza, pizza bubble ring (in kosher by design for kids), grilled cheese, fried fish, baked fish, sweet n’ sour salmon, sushi, fish patties
Chicken: barbecue, stuffed, chicken wrap, chicken salad, chicken cutlets, chicken capon, breaded, sesame, chicken w/ wine sauce, chicken cooked w/ veggies, roasted, southern fried, chicken knish, chicken wellington, cashew chicken, chicken rolled w/ pastrami, chicken fricasse (many of these are complicated so it depends if you have patience and time for it)
This is what I can think of now but you can make different combinations of things and different versions. Look in recipe books for more easy and good recipes. Good luck!