Add sugar, light brown sugar and vanilla extract to cooled brown butter. Whisk until well combined - about 1 minute.
¾ cup unsalted butter, ½ cup sugar, ¼ cup light brown sugar, packed, 1 tsp vanilla extract
Add egg yolk and whisk until well combined.
1 egg yolk
Add mashed banana and whisk until well combined.
¾ large ripe banana, mashed
In a separate bowl combine all purpose flour, baking soda, ground cinnamon and fine sea salt. Sift until well dispersed.
1 ½ cup all purpose flour, 1 tsp ground cinnamon, ½ tsp fine sea salt, ¼ tsp baking soda
Add dry ingredients to wet ingredients and whisk until just combined. Do not over mix.
Add chopped walnuts to batter and use fold into batter with a rubber spatula. Do not over mix.
¾ cup chopped walnuts or pecans
Use 2 tablespoon scoop to scoop out dough and place on baking sheet. Cover in plastic wrap or baking cover, and refrigerate for 1 - 2 hours.
Preheat oven to 375 F. Remove dough from refrigerator and place 5 - 6 cookies per baking sheet.
Bake for 11 minutes, or until edges become browned and slightly crispy. Remove from oven, sprinkle with flaky sea salt (optional) and allow to cool before enjoying.
flaky sea salt