Step 1

Preheat oven to 375 degrees. Stir together all-purpose and cake flours, baking powder, cornstarch, and salt; set aside.

Step 2

Beat butter in a large mixing bowl with an electric mixer on medium for 30 seconds. Add brown sugar and granulated sugar. Beat on medium for 1 minute more. Add eggs and vanilla; beat on medium for 1 minute more. Add eggs and vanilla; beat until combined. Gradually add flour mixture and beat until combined. Stir in chocolate chips.

Step 3

Form 1/4-cup portions of dough into balls and place 2-inches apart on a large, heavy, rimmed baking pan. Refrigerate for 30 minutes. Bake for 12 to 13 minutes or until golden brown on top. Cool cookies on a wire rack.