Preheat the oven to 350°F (175°C).

In a microwave-safe bowl, melt the butter. Add the sugar and stir until well combined.

In a separate bowl, beat the eggs and vanilla extract. Add the egg mixture to the butter-sugar mixture and mix until smooth.

In another bowl, sift together the flour, cocoa powder, and salt. Gradually add the dry ingredients to the wet ingredients and mix until just combined.

Fold in the chopped Oreo cookies.

Pour the batter into a greased 9x9 inch baking dish and spread it evenly.

Bake in the preheated oven for 25-30 minutes, or until a toothpick inserted into the center comes out with a few moist crumbs.

Allow the brownies to cool before cutting into squares. Enjoy!