Preheat the oven to 350F then line an 8×8 inch baking pan with parchment paper and set aside.

In a microwave-safe bowl, melt the butter, oil, and both sugars together in 30-second intervals mixing in between each time. Once fully melted, microwave for another 1 minute and stir vigorously to allow the sugar to melt fully.

Whisk in the eggs one at a time then add in the vanilla. You want the batter to pull from the bowl a little bit.

Add in the flour, cocoa powder, and salt and fold just until combined.

Pour half of the batter into the parchment paper-lined baking pan and spread evenly.

Place the Oreos in the center of the batter then top with the rest of the brownie batter and spread to cover.

Top with the 5 crushed Oreos and bake in the preheated oven for 30 minutes.

Allow the brownies to cool down fully on a wire rack before slicing into them for the perfect square crinkle top slice every time.