Instructions

  1. Preheat oven to 375.
  2. Combine flours, salt, and baking soda in a small bowl. Set aside.
  3. Put butter & sugars into bowl of electric mixer fitted with paddle. Mix on medium speed until pale and fluffy. Reduce speed to low. Add egg and vanilla; mix until combined. Mix in banana. Add flour mixture, mix until just combined. Stir in oats, chocolate chunks, and walnuts.
  4. Using 1 1/2" ice cream scoop (I used my Pampered Chef small scoop) drop dough onto baking sheets lined with parchment paper, spacing about 2" apart.
  5. Bake cookies (Martha recommends rotating sheets - I didn't do that) until golden brown and just set, 12-13 minutes. Cool on sheets 5 minutes & transfer to wire rack to complete cooling.
  6. Can be stored in airtight containers up to 2 days if not all eaten immediately.