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For the brownie batter:
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In a large mixing bowl, combine the eggs, oil, sugar, and vanilla. Stir well.
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In a second bowl, blend the flour, cocoa, salt and baking powder. Add the dry mixture to the wet mixture in 1-2 cup intervals, stirring just until all ingredients are blended. Add the chocolate chips last.
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For the cookie dough batter:
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Mix together brown sugar, granulated sugar, milk, egg and vanilla. Sift together flour, salt and baking powder; add to the sugar mixture. It will be a bit goopy, which is good. You don't want it to be tough like regular cookie dough. Stir in the chocolate chips.
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To assemble brownies:
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Spoon half of the brownie batter into the bottom of the pan. Smooth it out as well as you can with the back of your spoon.
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Next, add all of the cookie dough batter to the pan, one spoonful at a time. Try not to disturb the brownie layer as you add the second layer. Just get it as well distributed as you can-no big deal if it's not quite even.
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Finally, top the pan with the remaining half of the brownie batter, again trying not to disturb the lower layers. Place in the oven and bake at 350u00b0F. Start checking it at 30 minutes.
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When cooled, frost and slice as desired. The inner cookie layer is a wonderful contrast to the spongy brownie outside.
