Preheat the oven to 350°F and line two baking sheets with parchment paper and set aside.
In a medium bowl, whisk together the flour, cocoa, chocolate pudding mix, malt powder, salt, and baking soda. Set aside.
1½ cup all-purpose flour, ½ cup unsweetened cocoa powder, 2 tablespoons malt powder, ¾ teaspoon salt, ¼ teaspoon baking soda, 1 (3.4oz.) box instant chocolate fudge pudding mix
Add the shortening and sugars to a large bowl or stand mixer fitted with a paddle attachment and cream until smooth, about 1½ minutes.
½ cup light brown sugar, ½ cup granulated sugar, ½ cup vegetable shortening
Add in the egg and vanilla extract and beat until fully incorporated.
1 large egg, 1 teaspoon pure vanilla extract
Add half of the dry ingredients and half of the milk, mix until incorporated then add the rest and mix until thoroughly combined, about 1 to 2 minutes The dough should be thick but soft. Add an additional tablespoon of milk if needed.
⅓ cup whole milk
Fold in the chocolate chips.
1 cup mini chocolate chips
Portion the dough into 12 even portions (about 2.9oz. each) and roll into a ball.
Place the cookies on the baking sheet and press them down so they are about 1 inch thick, bake for 7 to 8 minutes until the edges are just set.
Allow the cookies to cool on the pan for 15 minutes before transferring them to a wire rack with a spatula to cool completely. Bake the other pan of cookies. These cookies are very soft right after baking and will firm up while they cool.
Once cooled, heat the hot fudge sauce in the microwave for 30 seconds, stir then add about 1 tablespoon to the top of each cookie, spreading it around the top with the back of the spoon. Let cool.
1 cup hot fudge sauce
Add the heavy cream and white chocolate pudding mix to a small mixing bowl and beat at medium-high speed until thick and fluffy, about 2 minutes. Pipe the frosting on top of the hot fudge on the cookies and top with a whopper and sprinkles.
1 cup heavy cream, 3 tablespoons white chocolate instant pudding mix, 12 Whopper candies, chocolate sprinkles
Chill in the refrigerator and serve cold.