Not much explanation needed, just butter some toasted bread and lay some sliced bananas on top. You could spread some honey or peanut butter on the bread first to make it even more tasty. I think that chocolate hazlenut spread Nutella would just be heavenly with bananas but I don't know about healthy! You could serve it as a closed sandwich if you prefer. And for younger babies, you could mash the banana and spread over the toast, then cut into sticks for them to eat with their fingers.