Unbelievable No-Cream, No-Cream-Cheese Dessert Ready in 15 Minutes!

Prepare the Base:
In a saucepan, combine the sugar, cocoa powder, milk, and butter. Heat over medium heat, stirring until the butter is melted and the mixture is smooth.
Break the cookies into small pieces and place them in a large bowl. Pour the chocolate mixture over the cookies and mix until well coated.
Press the cookie mixture into the bottom of a lined baking dish to form an even layer. Set aside.
Make the Chocolate Cream:
In a saucepan, whisk together the egg yolks, milk, corn starch, and sugar. Cook over medium heat, stirring constantly, until the mixture thickens.
Remove from heat and add the dark chocolate, stirring until it is fully melted and incorporated. Then, stir in the butter until smooth and glossy.
Pour the chocolate cream over the cookie base, spreading it evenly with a spatula.
Add the Topping: