Step 1: Preheat the Oven - Begin by preheating your oven to 350°F (175°C). This ensures that your brownies bake evenly and set perfectly.
Step 2: Prepare the Baking Pan - Grease your 9x9-inch baking pan with a bit of canola oil or line it with parchment paper for easier removal after baking.
Step 3: Combine Dry Ingredients - In a large mixing bowl, sift together the all-purpose flour, granulated sugar, unsweetened cocoa powder, baking powder, and salt. Whisk until well combined and set aside.
Step 4: Mix Wet Ingredients - In another bowl, whisk together the canola oil, eggs, and vanilla extract until smooth and well blended.
Step 5: Combine Wet and Dry Ingredients - Pour the wet ingredients into the dry ingredients and stir gently with a spatula until just combined. Be careful not to overmix, as this can lead to dense brownies.
Step 6: Add Chocolate Chips and Oreos - Fold in the semi-sweet chocolate chips, white chocolate chips, and crushed Oreos until evenly distributed throughout the batter.
Step 7: Pour and Spread the Batter - Pour the brownie batter into the prepared baking pan. Use the spatula to spread it evenly, ensuring the mixture reaches the corners of the pan.
Step 8: Bake the Brownies - Place the pan in the preheated oven and bake for 25-30 minutes. The brownies are done when a toothpick inserted in the center comes out with a few moist crumbs.
Step 9: Cool and Serve - Once baked, remove the brownies from the oven and let them cool in the pan on a wire rack. After they are completely cooled, slice them into squares and enjoy your delicious Oreo Brownies with White Chocolate!