01 - In a large chilled metal or glass mixing bowl, beat the heavy whipping cream, powdered sugar, and vanilla extract using an electric mixer set to medium-high speed. Whip until soft peaks form and the cream holds its shape when the beaters are lifted. Transfer to the refrigerator to maintain firmness until assembly.
02 - Rinse the peaches under cool water and pat dry. Using a sharp knife, cut each peach in half, remove the pit by twisting gently or cutting around it, then slice into uniform 1/2-inch wedges. If incorporating blueberries, rinse them thoroughly in a colander and pat dry with paper towels to prevent excess moisture from thinning the cream.
03 - Select individual dessert glasses, parfait dishes, or a large clear serving bowl to showcase the layered presentation. Arrange a base layer of peach slices along the bottom, followed by a scattering of blueberries if using. Continue layering until all fruit is distributed evenly, leaving approximately 1 inch of space at the top for the cream topping.
04 - Remove the whipped cream from the refrigerator. Using a rubber spatula or piping bag fitted with a large star tip, generously mound the cream over the fruit layers, creating decorative peaks and valleys. Ensure the cream completely covers the fruit while maintaining visual appeal through the glass sides.
05 - Finish by tucking fresh mint leaves into the cream around the edges and placing one or two sprigs on top. If using almonds, scatter the toasted slices across the surface for added crunch. Serve immediately for the freshest texture, or refrigerate for up to 1 hour to allow flavors to meld. Do not exceed 1 hour chilling time, as the fruit will release excess moisture and the cream may begin to separate.