Preheat the oven to 350F then line an 8x8 inch baking pan with parchment paper and set aside.
In a microwave-safe bowl melt the butter, oil, both sugars, and cocoa powder together in 30-second intervals mixing in between every time. Once fully melted microwave for another 1 minute and stir vigorously to allow the sugar to melt fully.
⅔ cup butter, ¼ cup vegetable oil, 1 cup granulated sugar, ⅓ cup brown sugar, ⅔ cup cocoa powder
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.
2 egg, 1 teaspoon vanilla extract
Add in the flour, and the salt and fold just until combined.
½ teaspoon salt, ½ cup all purpose flour
Pour half of the batter into the parchment paper-lined baking pan and spread evenly.
Place the Oreos in the center of the batter (see photo) then top with the rest of the brownie batter and spread to cover.
15 Oreos
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.