01 - Place a large mixing bowl in the freezer to chill for 5 minutes. Add cold heavy cream, powdered sugar, and vanilla extract to the chilled bowl. Using an electric mixer or whisk, beat until soft peaks form, about 3-4 minutes. Refrigerate the whipped cream until assembly.
02 - Rinse peaches under cool water and pat dry. Cut each peach in half, remove the pit, and slice into uniform wedges approximately 1/4 inch thick. If using blueberries, rinse thoroughly and drain well.
03 - Arrange peach slices in the bottom of individual serving glasses or a large glass serving bowl. Scatter blueberries evenly over the peaches, creating an even layer of fruit.
04 - Spoon or pipe the chilled whipped cream generously over the fruit layer, creating decorative mounds or peaks. Ensure all fruit is covered with a thick layer of cream.
05 - Top with fresh mint leaves, placing them strategically for visual appeal. Sprinkle sliced almonds over the cream if using. Serve immediately for the freshest presentation, or refrigerate for up to 1 hour before serving for a chilled dessert experience.