In a medium-sized mixing bowl, whisk together the flour, cornstarch, baking powder, and baking soda. Set it aside.
Using either a stand mixer, or a large mixing bowl and a handheld mixer on medium-high speed, beat the butter for 1 to 1½ minutes, until smooth.
Add the sugars and continue mixing on medium-high for 2½ to 3 minutes, until well combined.
Lower the mixer speed to low and add the egg. Continue mixing just until incorporated.
Increase the mixer speed to medium and the orange zest, vanilla extract, and orange flavoring. Mix just until combined.
Lower the mixer speed to low, and add ½ of the flour mixture at a time. Mix just until well incorporated.
Add in the chocolate chips, and mix just until combined. Cover the dough and chill in the refrigerator for 2 hours.
Preheat the oven to 375°F. Line 2 baking sheets with parchment paper. Using a 1 tablespoon cookie scoop, scoop the dough and place it on the prepared baking sheet. Space the dough 2 inches apart. Bake for 10 minutes. Allow the dough to rest on the cookie sheet for 5 minutes before transferring to a cooling rack to finish cooling completely.