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Heat oven to 350 degrees. Lightly grease the bottom and sides of a 9-inch round cake or pie pan.
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In a medium bowl, sift together the flour, sugar, cocoa powder, baking powder, and salt. Add in both kinds of chocolate chips. Whisk until blended.
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In a separate bowl, mix together the oil, eggs, and extract with a fork until just blended.
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Pour the liquid over the flour mixture and mix with a rubber spatula until just blended. The batter will be kind of dry, don’t worry. Stir in the Oreos.
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Scrape the mixture in to the pan and spread evenly. You might have to press the mixture in to the sides if you are having trouble spreading with a spatula.
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Bake for 20-25 minutes or until a toothpick or cake tester inserted in to the center comes out with only a few gooey pieces clinging to it. Transfer the baking dish to a cooling rack and let cool.
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Cut into wedges. If you want to-melt white chocolate and drizzle over the brownie wedges.