What’s the context, and what are the alternatives?
It’s definitely better than a vape and an energy drink. Probably not as good as something with more protein and complex carbohydrate like steel-cut porridge with nuts or seeds, or egg on toast.
But there’s no sense trying to aim for an unachievable goal, so if a banana and a glass of milk is as good as it’s going to get, then it’s good enough for now.