Heat oven to 350°F. Line two baking sheets with parchment paper; set aside.
In a medium bowl, whisk together flour, baking powder, salt, and espresso powder.
In another medium bowl, combine sugar and orange zest. Using your fingers, rub together until sugar turns yellowy-orange and you smell that citrusy goodness.
Add cocoa powder and melted butter, gently whisking until combined. Whisk in egg and vanilla.
Add flour mixture to wet mixture, mixing with a silicone spatula just until combined. Fold in chocolate chips and iyokan peel.
Form dough into balls that are about 1 ½ tablespoons each. (A #40 cookie scoop is super helpful here.) Top each with a couple chocolate chips.
Optional: Chill cookies for 30 minutes prior to baking.
Bake for 10 minutes or until edges are set.
Transfer baking sheets to wire racks. For perfectly round cookies, try Erin Clarkson’s cookie scoot method when they’re fresh out of the oven.
Taking care not to burn your fingers, gently press some chopped iyokan peel onto the top of each cookie.
Let cookies cool on baking sheets for about 10 minutes before transferring cookies to wire rack to cool completely.
Notes
These would also be delicious made with Kankitsu Labo Candied Yuzu Peel! If you go with yuzu, we also recommend swapping the orange zest with the zest of 2 lemons.
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