So this recipe is a lot more complicated than our usual ones, but it is absolutely worth the effort. However, you could just purchase a pre-made loaf of banana bread at the local bakery and then this recipe is cake (pun totally intended).
Here's the thing though, we are better at spreading peanut butter onto things than actually making them ourselves, so here are a couple of links to some healthy banana bread recipes. Decide which one is most appealing to you and then come back here for further instructions.
Healthy Whole Wheat Flower Banana Bread From Cookie & Kate
Paleo Banana Bread from Paleo Running Mama
Banana Bread Recipe with 5,000 reviews from All-Recipes