Preheat your oven to 350 and line two baking sheets with parchment paper.
Put peacans into a ziplock bag and roll over with a rolling pin to crush.
Whisk together flour, oats, cinnamon, nutmeg, baking soda, crushed pecans and salt. Set aside.
With a mmixed beat together butter, sugar and brown sugar for 2 minutes, until light and fluffy.
Add egg, mashed bananas and vanilla extract, then mix to combine.
Add flour and oats mixture and mix with a wooden spoon until well combined.
Scoop balls of dough and drop onto paper lined baking sheet, spacing 2" apart.
Bake for 14 - 17 minutes until golden brown and switching pans from top to bottom and front to back midway through.
Cool on baking sheet for a 5 minutes and transfer to a wire rack to cool completely. Enjoy!