Preheat oven to 350°. Line baking sheets with parchment paper. Set aside.
Add all-purpose flour, corn starch, baking soda, baking powder, and salt to a medium bowl. Whisk together.
Add butter, granulated sugar, and brown sugar to a large mixing bowl and cream together.
Add the egg and vanilla to the butter and sugar mixture. Cream until light in color and creamy.
Pour the flour mixture into the batter mix into the dough. Mix until just combined.
Fold in the chocolate chips.
Portion out the dough using a large cookie scoop (about 3 tablespoons). Roll cookie dough into a ball and space out on the perpared cookie sheets. About 6 balls per sheet.
Bake in your preheated oven for 12-14 minutes. Just until the edges are lightly golden.
Allow the cookies to cool on the pan for 15 min before removing to a wire rack.
Notes
The cookies will be puffy when they are removed from the oven. (they may or may not flatten as they cool-this is dependant upon how long you mix them and if the tempreture of the butter.For a puffier cookie: Use cold butter. A soft and chewy cookie is the result of room-temperature butter.