Set your oven to 350°F and prepare a baking dish by lining it with parchment paper.
In a bowl, combine almond flour, melted vegan butter, and maple syrup.
Press evenly into the prepared dish. Bake for 10-12 minutes until golden brown. Set aside to cool.
In a medium saucepan, whisk together lemon juice, lemon zest, coconut milk, powdered sugar, and cornstarch.
Heat over medium, whisking continuously, until the mixture thickens, which should take around 5-7 minutes.
Pour the filling onto the partially baked crust, spreading it out evenly.
Bake for another 15-20 minutes until the filling sets.
Allow to cool completely, then refrigerate for a minimum of 2 hours.
Once chilled, dust with powdered sugar, cut into squares and serve.