Creating Whimsical Unicorn Berry Pie is a breeze if you follow these simple steps:

1. Preheat Oven: Preheat your oven to 375°F (190°C). This ensures that your pie crust bakes evenly.
2. Prepare the Pie Crust: Place the pre-made pie crust in a 9-inch pie dish. Gently press it into the dish and trim any excess overhang. Poke the bottom with a fork to prevent bubbling.
3. Pre-bake the Crust: Bake the crust in the preheated oven for about 10-12 minutes or until lightly golden. Remove from the oven and let it cool completely.
4. Prepare the Berry Filling: In a mixing bowl, combine the mixed berries, lemon juice, cornstarch, sugar, and salt. Toss gently until the berries are coated evenly.
5. Fill the Pie: Pour the berry mixture into the cooled pie crust, spreading it evenly.
6. Make the Whipped Cream: In a separate bowl, whip the heavy cream, powdered sugar, and vanilla extract until soft peaks form. This will be your topping.
7. Assemble and Chill: Spread the whipped cream over the berry filling. For a whimsical touch, use a piping bag to create swirls and peaks. Sprinkle with edible glitter if desired. Chill the pie in the refrigerator for at least 30 minutes before serving to set the filling.

These steps will guide you in creating a stunning and delicious Whimsical Unicorn Berry Pie that will impress both in taste and appearance.