Step 2: Line an 8-inch (20 cm) square baking dish with parchment paper.
Step 3: In a large mixing bowl, combine the vegetable oil and granulated sugar. Mix until well combined. Add in the eggs and vanilla extract, whisk until smooth.
Step 4: In a separate bowl, sift together the flour, cocoa powder, baking powder, and salt.
Step 5: Gradually add the dry mixture to the wet ingredients. Stir gently until just combined.
Step 6: Fold in the crushed Oreo cookies.
Step 7: Pour the batter into the prepared baking dish and spread it out evenly. Bake for about 20-25 minutes.
Step 8: Let the brownies cool in the pan on a wire rack, then lift out using the parchment paper, slice, and serve.
Notes
Allow the brownies to cool completely before slicing for cleaner cuts. Store in an airtight container.