Crush the biscuit cookies into small pieces.

In a mixing bowl, combine crushed cookies, cacao powder, and softened butter.

Add the condensed milk, dulce de leche, and chopped pecans to the mixture.

Mix all the ingredients until well combined.

Shape the mixture into a log and wrap it in plastic wrap.

Refrigerate for at least 3 hours until firm.

Unwrap, slice, and serve.