Mix 2 packs of happy mug cake according to package instructions.
Transfer the cake batter mixture into your favorite ceramic 15 oz. mug and microwave it for 2 minutes. Remove cup from the microwave, be careful cup will be hot. Cool and set aside.
In a small bowl, mix together ¼ cup of whipped cream and spread until well blended then fold the rest of the whipped cream. Set aside.
In another small bowl, combine the caramel syrup (included in the mug cake) and 2 teaspoons of speculoos cookie butter spread and mix together until well blended. Set aside.
Pipe or dollop whipped cream on top of cake, drizzle caramel speculoos syrup on top of piped whipped cream then sprinkle some crushed speculoos cookies on top. Serve