Place one oven rack in the center position and another in the bottom third of the oven. Heat the oven to 350º F (177º C). Line 2 cookie sheets with parchment paper or silicone baking mats.
In a large mixing bowl, mash the banana until smooth. Add the oil, honey, vanilla, baking soda, salt, and cinnamon. Whisk until well combined.
⅓ cup mashed ripe banana, ⅓ cup avocado oil, ½ cup honey, 1 tsp vanilla, ½ tsp baking soda, ½ tsp kosher salt, ½ tsp cinnamon
Add the flour. Mix until no more dry flour remains.
1 cup whole wheat
Fold in the oats, chopped walnuts, and dried cranberries.
2 cups old fashioned oats, ½ cup chopped walnuts, ½ cup dried cranberries
Form the dough into 24 balls that are about a scant 2 TBS each. The dough will be sticky. Wet your hands to prevent sticking. Place the cookie dough balls about 2" apart on the lined cookie sheets.
Bake for 12 minutes, rotating the cookie sheets and switching from top rack to bottom rack and bottom rack to top rack halfway through baking.
Let the cookies cool on the baking sheets for 5 minutes before transferring them to a wire rack to cool completely. Enjoy warm, or store them for a grab-and-go breakfast or snack during the week!