Begin by mixing 2 packs of unflavored gelatin with milk. Heat the mixture over high heat until it's on the verge of boiling. Once heated, allow it to cool to a warm temperature before using.
While allowing the milk gelatin to cool, it's time to craft the cream. In the electric mixer's bowl, combine sugar and sour cream, ensuring a seamless blend and complete sugar dissolution.
Start by pouring heavy whipping cream and mixing it until it's well combined. Then, add vanilla and salt, and continue mixing for a few more minutes.
Keep the mixer running and gradually incorporate the warm milk/gelatin mixture. Continue mixing for a few minutes. Initially, the consistency will resemble buttermilk, but it'll quickly thicken as it cools.
Pour 3.5 oz of the runny vanilla mousse into parfait cups and chill in the fridge to set.
In a small saucepan, combine milk, sugar, cacao, gelatin, vanilla, and salt. Place it over high heat and stir continuously to bring it to a boil. The goal is to achieve a smooth cacao topping. Once done, set it aside and allow it to cool to a warm temperature before using it to top the parfaits.
Carefully drizzle the cacao topping over the vanilla mousse base, and refrigerate for about 30 minutes.
While allowing the cacao topping to harden, simultaneously prepare the whipping cream topping.
Whisk cold heavy cream and powdered sugar until it thickens.
Enhance your parfait presentation with these steps: Start by adorning each parfait cup with a charming star. Next, add a vibrant contrast by topping the cream with raspberries. Place a sprig of fresh mint next to the berries for a delightful touch. Lastly, use a potato peeler to elegantly shave dark chocolate over each parfait, elevating the overall appeal.
For best results, refrigerate the parfaits for a couple of hours before serving.