If you want a burger or chicken tenders, go to a burger and chicken tender place (i.e.-Plaza). Maybe where I live is different, but I expect a restaurants children menu to be a direct correlation to the adult menu. It's like this for ease of prep in the kitchen and to minimize inventory/food wastage. I don't go to a Mexican restaurant and expect a pizza. I don't go to a Chinese restaurant and expect a burger.
The other MK restaurants have mac and cheese, grilled chicken, grilled fish, steak, meatloaf, pizza, spaghetti and meatball, and grilled cheese on their menus. That's a nice, wide selection. I've seen most of these meals with my kids and they are not in any way adventurous. In fact, they are quite plain and boring.