Begin by preparing the strawberries: In a medium bowl, combine the sliced strawberries with the granulated sugar. Gently toss to ensure all the slices are coated in sugar. Allow the mixture to rest for about 15-20 minutes.
While the strawberries are macerating, take another bowl and pour in the heavy cream. Whisk in the sweetened condensed milk and vanilla extract until the mixture is smooth and well blended.
After the strawberries have macerated, gently fold them — along with the juices they have released — into the creamy mixture. Then, add the crushed shortbread cookies, stirring carefully until all ingredients are evenly combined.
Prepare an 8x8 inch square baking dish by lining it with parchment paper. Make sure to leave some overhang, as this will help you lift the bars out later. Pour the strawberry shortcake ice cream mixture into the lined dish and spread it out evenly.
Cover the dish tightly with plastic wrap or aluminum foil, placing it in the freezer. Allow it to freeze for at least 4-6 hours, or until it is firm enough to hold its shape.
When ready to serve, retrieve the dish from the freezer. Using the parchment overhang, lift the whole block of ice cream out of the dish. Place it on a cutting board and cut into squares or rectangles using a sharp knife.
To serve, place each bar on a plate, and top it with a generous dollop of whipped cream. Finish with a sprinkle of extra crushed shortbread cookies and a few fresh mint leaves for garnish.
Notes
Serve the ice cream bars on a vibrant, colorful plate. Drizzle any leftover strawberry juice around the bars for an attractive splash of color.