These cookies are soft & chewy, with crisp edges and melty pools of dark chocolate, and studded with candied orange pieces.
In a large mixing bowl, add granulated sugar and orange zest. Use your fingertips to massage zest into sugar until fully incorporated. Add brown sugar, melted butter, milk, and vanilla. Whisk vigorously until creamy and combined.
Add flour, corn starch, salt, and baking soda. Use a wooden spoon or rubber spatula to combine until a soft dough forms. Fold in chopped chocolate and candied orange pieces. Cover and refrigerate for at least 1 hour.
Preheat oven to 350°F. Use a 1.5 tbsp cookie scoop to portion out dough and distribute on baking sheet. Top each cookie with additional chopped chocolate and candied orange pieces.
Bake for 12 minutes until edges are golden brown. The center may feel a bit underdone, but they will continue to bake out of the oven. Optional: To create perfectly round cookies, place a mug/glass or circular cookie cutter over the warm dough and do a little swirl to form a round cookie. Allow cooling on the baking sheet for 10 minutes before transferring to a wire cooling rack.
Garnish with flaky sea salt and enjoy!