Prepare the Cookie Mixture
In a large mixing bowl, break the cookies into small chunks. Aim for bite-sized pieces rather than crumbs to retain a nice texture in the final cake. Add the chopped walnuts and stir to distribute evenly.
Make the Chocolate Mixture
In a saucepan, combine the cocoa powder, sugar, and milk. Heat over low to medium heat, stirring continuously until the mixture is smooth and the sugar has dissolved. Avoid boiling; just heat enough to blend everything well.
Add the Butter and Melted Chocolate
Remove the saucepan from the heat and stir in the melted butter and melted chocolate. Mix until everything is well combined, resulting in a glossy, thick chocolate sauce.
Combine the Mixtures
Pour the chocolate mixture over the cookie and walnut mixture. Use a spatula to gently fold everything together until the cookies and nuts are fully coated in chocolate.
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