Unwrap and roll out the pie crusts. Preheat the oven to 350˚F.
For a standard muffin pan, use a 4 1/2-inch round cookie cutter to cut out the circles of dough. For a mini-muffin pan, use a 2 1/2-inch round cookie cutter.
Place the dough circle on top of the muffin tin opening. Push down on the large end of the tart tapper to form the tart.
Use a small fork to prick the bottom of the tart shell.
Place the muffin pan in the oven and bake for 10 - 12 minutes
Remove the muffin pan from the oven and allow to cool. Remove the tarts to a cooling rack and allow to cool completely.
For the Whipped Cream:
Place a pastry tip in a pastry bag. Place the bag in a tall glass or tall canister.
Place 1 cup of heavy whipping cream in the bowl of the stand mixer with the whisk attachment. Start on low speed for 30 - 60 seconds. Increase the speed to medium-high until soft peaks form. Add 1 to 2 tablespoons (or to your taste) of the powdered sugar. Whisk until firm peaks form.
Use a rubber spatula to spoon the whipped cream into the pastry bag.
Using two small spoons, fill the tart shells with the lemon curd, about 2 - 3 tablescapes. Use one spoon to smooth the top of the filling.
Pipe the whipped cream on the top of the lemon curd, covering the entire surface.
Use a mint leaf, lemon zest, or fresh berries, such as a blueberry or raspberry to garnish the tarts.