Preheat the oven to 375°. Lightly coat a baking sheet with cooking spray. In a medium bowl, combine the flour, cornstarch, baking soda, and salt. In a large bowl. combine the butter and cream cheese. With an electric mixer on medium speed, beat for 1 minute or until smooth. Add sugar and brown sugar. Beat until light and creamy. Add the egg, egg white, and vanilla. Beat until smooth. Reduce mixer speed to low. Add the flour mixture in 2 additions, beating just until combined. With a spoon, stir in the chocolate chips. Drop dough by rounded teaspoonfuls onto baking sheet. Bake 9-12 minutes until golden. Transfer the cookies to a rack to cool. Repeat until all the cookies are baked.
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