Creating these Fudgy Cookies and Cream Brownies is straightforward. Follow these clear and simple steps for a successful outcome:

1. Preheat the Oven: Preheat your oven to 350°F (175°C). Prepare a 9×9 inch baking pan by greasing it or lining it with parchment paper for easy removal.
2. Combine Butter and Sugar: In a large mixing bowl, combine the melted butter and granulated sugar. Stir until fully mixed.
3. Add Eggs and Vanilla: Crack in the eggs and add the vanilla extract. Mix until smooth.
4. Mix Dry Ingredients: In a separate bowl, sift together the cocoa powder, flour, salt, and baking powder.
5. Combine Mixtures: Gradually add the dry ingredients to the wet mixture, stirring until fully combined. Do not overmix.
6. Fold in Oreos and Chips: Gently fold in the crushed Oreo cookies and white chocolate chips, ensuring they are evenly distributed.
7. Pour Batter into Pan: Pour the brownie batter into the prepared baking pan, smoothing it out evenly with a spatula.
8. Top with Extra Oreos: Arrange extra Oreo cookies on the top of the brownie batter if desired for an appealing look.
9. Bake: Place in the preheated oven and bake for 25 minutes. The brownies are done when a toothpick inserted into the center comes out with a few moist crumbs.
10. Cool: Allow the brownies to cool in the pan on a wire rack for at least 30 minutes before slicing.

By following these steps, you will create a batch of incredibly fudgy and satisfying brownies that everyone will love.