Preheat oven to 350F and line a large cookie sheet with parchment paper. In a medium bowl, whisk all-purpose flour, ground cinnamon, sea salt and baking soda. Set aside. In a large bowl, add sugar and butter and mix well until almost all the butter has absorbed into the sugar. Add banana, egg yolk and vanilla extract and mix again. Mix the dry ingredients into the wet ingredients stir to combine, ensuring everything is well blended.

Fold in chocolate chunks and chips. Allow the batter to rest and thicken up for about 5-10 minutes. Using a 3 tablespoon cookie scooper, drop cookie dough balls at least 2 inches from each other; these cookies spread out. Optionally, add additional chocolate chips to the tops of the cookies and bake for 10 minutes to get a cookie with a lightly underdone center or 12 minutes if you prefer a slightly crisper texture.