Preheat the oven to 350°F (175°C) and line a baking sheet with parchment paper or a silicone baking mat.

1. In a large mixing bowl, cream together the softened butter, granulated sugar, and brown sugar until light and fluffy, about 2-3 minutes.
2. Add the eggs, one at a time, mixing well after each addition. Stir in the vanilla extract.
3. In a separate bowl, whisk together the all-purpose flour, cocoa powder, baking soda, and salt. Gradually add the dry ingredients to the wet ingredients, mixing until just combined.
4. Fold in the coarsely chopped Oreo cookies and chocolate chips (if using). Ensure even distribution.
5. Scoop about 2 tablespoons of dough and roll into balls. Place dough balls on the prepared baking sheet, spaced 2 inches apart. Optionally, press a whole Oreo cookie into the top of each dough ball.
6. Bake for 10-12 minutes or until the edges are set but the centers are still soft. Don’t overbake to keep them chewy.
7. Allow the cookies to cool on the baking sheet for 5 minutes before transferring to a wire rack to cool completely.