Heat oven to 250°F. Line a large baking sheet with parchment and set aside.
Whisk egg whites with salt and cream of tartar on medium speed until soft peaks form.
Rain in the sugar a tablespoon at a time, beating on medium-high until glossy, stiff peaks hold and sugar dissolves.
Beat in vanilla and vinegar briefly. Sift cornstarch over the meringue and fold gently to combine.
Spoon 8 small mounds onto the sheet and use a spoon to make shallow wells in the centers.
Bake 60–70 minutes until dry to the touch and pale. Turn off oven, crack the door, and cool inside until barely warm.
Whip heavy cream with powdered sugar just to soft peaks; keep chilled.
Fill pavlovas with whipped cream. Top with berries, dust with powdered sugar, and garnish with mint.
Notes
Variation: Swirl 2 tbsp lemon curd into the whipped cream, or drizzle the finished pavlovas with melted dark chocolate. Storage: Keep unfilled shells airtight at room temperature up to 3 days; add cream and fruit just before serving.This recipe is an original creation inspired by classic Mini Pavlovas Made Easy flavors. All ingredient ratios and instructions are independently developed.