mOcha cinnamOn chOcOlate chip cOOkies

Ingredients

• 8 oz roughly chopped bittersweet chocolate (60% cacao, not chips)
• 1 cup chopped walnuts
• 2 ¾ cups all-purpose flour
• ¾ tsp ground cinnamon
• 2 sticks unsalted butter, room temperature
• 1 cup granulated sugar
• 1 cup brown sugar
• 2 tsp kosher salt
• 1 tsp baking soda
• ½ tsp baking powder
• 1 tbsp vanilla extract
• 3 tbsp espresso powder
• 1 large egg, room temperature
• flaky sea salt