In a large mixing bowl, cream together the softened butter, granulated sugar, and brown sugar until light and fluffy.
Beat in the eggs, one at a time, until well combined. Stir in the vanilla extract.
In a separate bowl, whisk together the all-purpose flour, baking soda, ground cinnamon, salt, and instant coffee granules.
Gradually add the dry ingredients to the wet ingredients, mixing until just combined. Be careful not to overmix.
Fold in the semisweet chocolate chips and chopped nuts, if using.
Press the dough evenly into the bottom of a greased 9x13-inch baking dish.
Preheat your air fryer to 325°F (160°C).
Place the baking dish in the preheated air fryer basket and cook for 25-30 minutes, or until the edges are golden brown and a toothpick inserted into the center comes out clean.
Remove the baking dish from the air fryer and let the bars cool completely before slicing and serving.
Enjoy your delicious Air Fryer Chocolate Chip Cappuccino Bars with a cup of coffee or your favorite hot beverage!