Rinse the grapes thoroughly under cold water and pat them dry.
Cut the grapes in half, removing any stems.
In a large mixing bowl, combine Greek yogurt and softened cream cheese.
Add honey and vanilla extract to the bowl, mixing well until smooth.
Fold in the halved grapes gently to coat them in the dressing.
Add mini marshmallows and chopped nuts into the mixture.
Season with a pinch of salt for balance.
Stir all ingredients until well combined.
Refrigerate the salad for at least 30 minutes to chill.
Garnish with fresh mint leaves before serving.