Preheat the oven to 350℉ and prepare the pan (grease and flour or line with parchment paper).
Mix together the flour, oats, baking powder, baking soda, salt, and cinnamon.
In a separate bowl, cream the butter, sugars, and peanut butter. Add the egg and vanilla, and mix until combined.
Add the mashed banana and mix just until combined.
Add the flour mixture to the wet batter in a couple additions, and mix until combined.
Fold in most of the chocolate chips, pecans and shredded coconut (reserving a little of each to decorate the top).
Pour into prepared pan and bake for approximately 40-45 minutes or until toasty brown on top and toothpick/tester comes out clean.
Enjoy!