Cooking for 5 year Olds

I am in Denver at this time, not rural Pennsylvania. I am staying at my brothers house, he and his wife have two little boys, I am surprised to learn about kids food. They LOVE bland boring foods. Chicken fingers, mac and chesse, jello, ceral, pizza, french fries, fish sticks, chicken. Most of the things that they will eat are dull and bland, I cannot wait to get back to Rural PA and start cooking again for my wife. I want to make some spicy spicy hot hot food.