Preheat the oven to 350°F. Lightly grease an 8x8 square pan.
In a medium bowl, mix together the oil and sugar. Beat in the eggs and vanilla extract until fully combined.
In a medium bowl, mix together the baking powder, cocoa powder, salt and flour.
Mix in the dry ingredients to the wet ingredients until fully incorporated. Fold in the chopped Oreos.
Pour the batter into the prepared pan and bake in the preheated oven for 23-25 minutes, or until a toothpick inserted comes out clean.
Allow to cool completely before cutting into squares.