Preheat the oven to 350 degrees F.
Sift together the flour, baking powder, baking soda, and salt set aside. ,
Add the butter, sugar, and 1/2 cup brown sugar to a medium mixing bowl. With an electric mixer mix until well combined.
Separate the yolks from the egg whites. Place the whites in a separate bowl and add the yolks and vanilla to the butter and sugar mixture and mix well.
Add the flour mixture to the dough and mix well.
Pat the dough into an ungreased 9 by 13-inch baking pan. Sprinkle the chocolate chips over the base.
Take the egg whites and with an electric mixer (with clean beaters) mix until stiff peaks form.
Add the remaining brown sugar and mix well.
Spread the meringue over top of the chocolate chips.
Bake in preheated oven for 20 to 25 minutes or until the meringue is lightly browned.