Preparation

• In a large bowl, combine the melted butter, brown sugar, and mashed banana. Mix to combine.
• Add the egg yolk and vanilla extract. Mix well.
• Add the flour, baking soda, and cinnamon. Stir until combined and no streaks of flour remain.
• Last, fold in the chocolate chips. Cover and set aside to let the flour hydrate in the dough while the oven preheats, about 15 minutes.
• Line a cookie sheet with parchment paper and preheat the oven to 350°F. Once the oven is preheated use a cookie scoop or a spoon to scoop out about 1 inch dough balls, placing them about 2 inches apart on the prepared cookie sheet. The dough will be a little wet!
• Bake for 10 to 11 minutes or until the edges are set and the cookies have puffed up, but the middles are still underbaked.