In a medium-sized mixing bowl, mix together the graham cracker crumbs and shredded coconut. Add the melted butter and stir well until all the crumbs are thoroughly coated.
Transfer the crumb mixture into a greased 9x9 inch baking dish. Using the back of a measuring cup or your fingers, press the mixture firmly to create an even, compact crust. Place the dish in the refrigerator to chill while you prepare the lemon filling.
In a large mixing bowl, whisk the sweetened condensed milk, fresh lemon juice, lemon zest, and vanilla extract together until smooth and well combined.
In a separate bowl, use an electric mixer to whip the heavy cream. Start on low speed and gradually increase to medium-high speed, whipping until soft peaks start to form. Gradually add the powdered sugar while continuing to whip, until stiff peaks form.
Carefully fold the whipped cream into the lemon mixture in batches, gently incorporating it without deflating the cream, until fully combined and luscious.
Pour the creamy lemon filling over the chilled crust, and use a spatula to spread it evenly across the surface. Cover the dish with plastic wrap and refrigerate for at least 4 hours, or until the lemon filling is completely set.
Once set, remove from the fridge, cut into squares or bars, and serve chilled.
Notes
Arrange the bars on a beautiful platter and garnish with fresh mint leaves and thin slices of lemon for an inviting presentation that enhances the bright flavors. Enjoy your refreshing treat!