Prepare the brownies according to your favorite recipe or package instructions.
Hull and slice the strawberries.
In a mixing bowl, whip the heavy cream with powdered sugar and vanilla extract until soft peaks form.
Cut the cooled brownies into 1-inch cubes.
Begin layering the trifle: add a layer of brownie cubes to the bottom of your serving dish.
Spoon a layer of strawberry slices over the brownies.
Add a layer of whipped cream over the strawberries.
Repeat the layering process until all ingredients are used, finishing with whipped cream.
Garnish the top with mint leaves and extra strawberry slices if desired.
Refrigerate the trifle for at least 1 hour before serving.