Method
1. Pre-heat oven - 190°C
2. Line 2 clean baking sheets with parchment paper
3. Add all purpose flour, whole wheat flour, baking soda and salt to a clean medium bowl
4. Whisk briefly until blended
5. Add unsalted butter, granulated sugar and light brown sugar to a clean large mixing bowl
6. Cream together
7. Add egg, banana and vanilla extract to the large mixing bowl
8. Mix until combined
9. Mix dry ingredients into large mixing bowl bit by bit until just combined
10. Add rolled oats and chocolate chips to a clean medium bowl
11. Add walnuts to the dry ingredients
12. Transfer content of medium bowl to large mixing bowl
13. Mix large mixing bowl until just combined
14. Scoop content of large mixing bowl onto 2 baking sheets
15. Bake until golden brown - 15 min, 190°C
16. Transfer onto cooling rack