I adapted this recipe from Giada DE Laurentiis who hosts Everyday Italian on the Food Network.
In Giada's recipe she uses a combination of lemon zest and orange zest, as well as Pistachios. I used orange zest only, omitted the Pistachios and added semi-sweet chocolate chips instead. I also adjusted the baking time (I baked them 10-15 minutes less).
The second batch needed some dressing up, so I covered them with dark chocolate and sprinkled on some fresh orange zest. Yum!
If you'd like the recipe just leave me a comment.