Preheat the oven to 400°F. Line 2 baking sheets with parchment paper or silicone baking mats and set aside.
Whisk together the dry ingredients (flours, cornstarch, baking soda, baking powder, salt cinnamon, nutmeg) in a large bowl and set aside.
1 1/2 cups All Purpose Flour, 1 cup cake flour, 1 tsp. cornstarch, 1/2 tsp. baking powder, 1/2 tsp. baking soda, 1/2 tsp. salt, 1/2 tsp. cinnamon, 1/4 tsp. nutmeg
Cream together the butter, sugar and brown sugar using a stand mixer fitted with the paddle attachment, on medium speed until light and fluffy, ~3-4 minutes. 8 Tbsp. unsalted, cold butter, cut into cubes, 1/2 cup brown sugar, packed (light or dark), 1/4 cup sugar
Add in mashed bananas, followed by the egg, egg yolk and vanilla until combined.
1 large egg, 1 large egg yolk, 2 over ripe bananas, mashed (about 3/4 cup), 1 tsp. vanilla extract
Add in dry ingredients, gradually until ingredients are incorporated.
Add in chocolate chips until combined.
1 3/4 cup chocolate chips
Using floured hands and a cookie scoop, measure out ~10-12 cookies for large cookies, or scoop 2 Tbsp. sized cookies (you should get ~22 cookies). The dough will be a bit sticky due to the bananas. The flour will help! Or you can just use the cookie scoop to scoop directly onto the sheet pan to avoid using flour.
Place on prepared baking sheet & bake cookies for ~13-14 minutes for the large cookies, or ~8-10 minutes for the smaller cookies.
Let cookies cool, then make the cream cheese frosting. Mix together the softened cream cheese and butter using a hand mixer. Then add in the powdered sugar, vanilla and salt. Mix until smooth. Add more powdered sugar as desired.
4 oz. cream cheese, softened, 4 Tbsp. unsalted butter, softened, 1 cup powdered sugar, sifted, 3/4 tsp. vanilla extract, pinch of salt
Frost cooled cookies, garnished with nuts and ground cinnamon if desired. Enjoy!
chopped walnuts and ground cinnamon for garnish, optional