Preheat the oven to 350 degrees Fahrenheit (180 degrees Celsius). Line a square baking pan with parchment paper, leaving 1-2 inches of overhang so you can lift the brownies out.
Add the chopped chocolate and butter to a medium heatproof bowl. Microwave for 1-2 minutes, stirring every 20 seconds until melted and smooth. Let cool slightly.
In a separate large bowl, beat the granulated sugar, brown sugar, eggs, egg yolk, vanilla, and vinegar with an electric mixer or stand mixer with the paddle attachment on medium-high speed for 2-3 minutes or until the mixture is foamy and pale yellow. Then mix in the food coloring on low speed.
200 grams granulated sugar, 55 grams brown sugar, 3 large eggs, 1 egg yolk, 2 teaspoons vanilla extract, 1 teaspoon white vinegar, ½ teaspoon red gel food coloring
Scrape down the sides of the bowl. Turn the mixer on low and stream in the melted chocolate mixture. Mix until well combined.
Stop the mixer and add the flour, cocoa powder, and salt. Gently fold them in with a rubber spatula until there are a few white streaks of flour remaining.
94 grams all purpose flour, 25 grams cocoa powder, ½ teaspoon salt
Add the Oreos to a large zip-top bag and smash them with a can or rolling pan. Fold most of the crushed Oreos into the brownie batter, leaving some pieces to sprinkle on top.
16 Oreo cookies
Spread the batter into an even layer in the prepared pan. Top with more Oreo pieces. Bake for 30-36 minutes until a toothpick inserted in the center comes out with sticky crumbs, but no wet batter.
Carefully take the brownies out of the oven and let cool in the pan for 5-10 minutes. Lift the parchment paper out of the hot pan and transfer the brownies to a wire rack. Cool completely.
Slice the brownies with a sharp knife and enjoy!
Notes
Use room temperature eggs so they mix into the batter fully.Measure the flour in grams with a kitchen scale for the best results.Storage: Store in an airtight container at room temperature for up to 4 days or in the refrigerator for 5-6 days.Freezing: Let the brownies cool completely, then cut into squares. Wrap each in plastic wrap and aluminum foil. Place in a sealed container and freeze for up to 3 months.