Preheat your oven to 350°F (175°C). Line an 8x8 inch baking pan with parchment paper, making sure there's some overhang on the sides for easy removal later.
In a medium-sized mixing bowl, combine the almond flour, shredded coconut, melted coconut oil, maple syrup, and salt. Stir the mixture until it forms a crumbly, moist dough.
Transfer the dough into the prepared baking pan, pressing it firmly and evenly into the bottom to create a solid crust. Place in the preheated oven and bake for 10-12 minutes, or until it turns a light golden color.
While the crust is baking, prepare the lemon filling. In a separate mixing bowl, whisk together the lemon zest, fresh lemon juice, cornstarch, baking powder, and the remaining maple syrup. Stir until the mixture is smooth and well combined.
Once the crust has baked, carefully remove it from the oven and pour the lemon mixture over the hot crust, spreading it evenly with a spatula for an even layer.
Put the pan back into the oven and bake for an additional 15-20 minutes, or until the filling is set and has a slight jiggle in the center.
Once baked, take the pan out of the oven and let it cool completely at room temperature in the pan. For best results, refrigerate for at least 2 hours to let it firm up, which will make slicing easier.
After chilling, use the parchment paper to lift the bars out of the pan. Cut into squares or rectangles as desired.
Notes
Lightly dust the top of the bars with shredded coconut and garnish with a slice of lemon or fresh mint leaves.