Preheat your oven to 350°F (175°C). Grease and flour a round cake pan, or line it with parchment paper.

In a large mixing bowl, sift together the all-purpose flour, sugar, cocoa powder, baking powder, and salt.

In another bowl, beat the softened butter until creamy, then add in the eggs one at a time, mixing well after each addition. Stir in the vanilla extract.

Gradually mix the dry ingredients into the wet ingredients, alternating with the milk, to create a smooth batter without overmixing.

Gently fold in crushed Oreo cookies. Be careful not to break them down too much; you want some nice chunks for added texture.

Pour the batter into your prepared cake pan and bake for 30-35 minutes, or until a toothpick inserted into the center comes out clean.

Let the cake cool in the pan for 10 minutes before turning it out onto a wire rack to cool completely.

Serve as is or add your favorite toppings, like vanilla ice cream or whipped cream.