If you don't want to make individual dirt cups, you can absolutely make this into one big dirt pudding! For that, use a trifle dish or clear serving bowl and layer in cubes of the brownies before topping with the pudding and cookie crumbs. Chill in the fridge and decorate as before with the Halloween candies.  Feel free to garnish with additional whipped topping or whipped cream if you want, especially if you're dressing this up for adults!