Preheat oven to 350F and lightly butter an 11x7 brownie pan. You can also use a 9x9 baking pan, but the baking time may vary slightly.
In a mixing bowl, whisk together the flour, sugar, cornstarch and salt.
Add the melted butter and the vanilla extract, and mix together until a soft dough is formed. If your dough is still warm to the touch, allow it to cool to room temperature before adding the chocolate chunks, so they don't melt.
Fold in the chocolate, either with a spoon or with your hands, until evenly distributed.
Crumble the dough evenly into the prepared pan.
Press the dough down with floured fingertips, or the bottom of a metal measuring cup. Smooth out the surface with an offset spatula.
Bake for about 25-30 minutes, until just starting to turn light golden brown around the edges. Allow the cookies to cool partially before slicing.
Nutritional information is provided as a courtesy and is an estimate only. This information comes from online calculators. Although The View from Great Island attempts to provide accurate nutritional information, these figures are only estimates.
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