In a medium bowl sift together the flour, cornstarch and salt. Set aside.
In a large bowl add eggs, sugar, olive oil, zest and baking powder, mix together with a fork or whisk until smooth, mix in the chocolate chips and then add a little at a time the sifted flour mixture. When almost combined move the dough to a lightly floured flat surface and gently knead until smooth (not sticky, if too sticky add a little more flour at a time).
Roll the dough to a 1/4 inch (1 cm) thickness and cut out with a 2 1/2 inch (6cm) round cookie cutter. Place on parchment paper lined cookie sheets and refrigerate for approximately 15-20 minutes.
Pre-heat oven to 350F (180C).
Remove from the fridge and bake for approximately 10-15 minutes, (do not let the cookies brown they should be lightly golden). Let cool on cookie sheets. Enjoy.