Making Nostalgic Strawberry Fluff is a delightful process. Follow these steps to create this amazing dessert:

1. Prepare the Strawberries: In a medium bowl, combine the chopped strawberries with 1/2 cup of granulated sugar. Let them sit for about 10 minutes to release their juices.
2. Whip the Cream: In a separate bowl, whip the heavy cream with the remaining 1/2 cup of granulated sugar and vanilla extract until soft peaks form.
3. Combine Ingredients: In a large mixing bowl, fold the whipped cream into the sour cream until well combined.
4. Add Strawberries: Gently fold in the macerated strawberries along with their juices, ensuring the mixture is evenly combined.
5. Incorporate Marshmallows: Carefully add the mini marshmallows into the mixture, folding them in gently to maintain the fluffy texture.
6. Chill: Transfer the mixture to a serving bowl or individual cups and cover it with plastic wrap. Refrigerate for at least 1-2 hours to allow the flavors to meld and the fluff to set.
7. Garnish: Before serving, garnish with additional fresh strawberries if desired.

These steps will guide you through the process of creating this incredible dessert effortlessly.