Step 1: Preheat your oven to 350°F (175°C). Line a 9x13 inch baking pan with parchment paper, leaving some overhang for easy removal later.
Step 2: In a large mixing bowl, combine the vegetable oil and granulated sugar. Whisk until fully combined. Add the eggs, vanilla extract, and salt, continuing to mix until smooth. Sift in the cocoa powder and flour, stirring until just combined. Be careful not to overmix!
Step 3: Pour the brownie batter into the prepared baking pan, spreading it evenly. Bake in the preheated oven for about 25-30 minutes, or until a toothpick inserted into the center comes out with a few moist crumbs. Remove from the oven and let it cool completely in the pan.
Step 4: While the brownies are cooling, it’s time to make the Oreo truffle filling. In a food processor, crush the Oreo Cookies until they resemble fine crumbs. In a separate bowl, mix the crushed Oreos with the cream cheese until well combined and smooth.
Step 5: Once the brownies have cooled completely, spread the Oreo truffle mixture evenly over the brownie base. Make sure to cover it nicely for that delicious truffle experience.
Step 6: In a microwave-safe bowl, combine the chocolate chips and 1 tablespoon of vegetable oil. Microwave in 30-second intervals, stirring in between until fully melted and smooth.
Step 7: Pour the melted chocolate over the Oreo layer, spreading it evenly with a spatula. Allow the brownies to set at room temperature or refrigerate for quicker results.
Step 8: Once the chocolate has set, use the parchment paper to lift the brownies out of the pan. Slice them into squares and serve. Enjoy the combination of chewy brownie, creamy Oreo filling, and luscious chocolate!