Prep Your Cashews: First things first, soak your 1 ¼ cups of cashews! For the creamiest filling, let them soak in water overnight. If you're short on time, pour boiling hot water over them and let them sit for 3 to 4 hours until they're nice and soft. Drain well before using.
Make the Crust: In a food processor, combine all the crust ingredients: pitted dates, ¾ cup raw cashews, almond flour, cinnamon, vanilla extract, and sea salt. Pulse until a sticky, dough-like mixture forms. Be careful not to over-process; it should resemble a thick cookie dough, not a smooth butter.
Form the Crust: Press this sticky dough evenly into an 8x8 inch baking pan that's been lined with parchment paper, leaving a slight overhang on the sides for easy removal. Pop the pan into the fridge or freezer while you get the filling ready.
Whip Up the Filling: Add the drained, soaked cashews, lime juice, lime zest, maple syrup, melted coconut oil, coconut milk, and vanilla extract to your food processor or a high-powered blender. Blend until the mixture is incredibly smooth and creamy, with no cashew bits remaining. Scrape down the sides as needed.
Taste and Adjust: Now's the fun part! Taste your filling. If you prefer a tarter pie, add a little more lime juice. If you like it sweeter, stir in more maple syrup until it's just right for you.
Assemble and Chill: Pour the dreamy key lime filling over your prepared crust in the pan. Gently spread it out evenly.
Freeze to Perfection: Place the pan in the freezer and let the bars chill overnight, or until they are completely solid. This is crucial for easy slicing!
Serve and Enjoy: When you're ready to serve, take the pan out of the freezer. Use the parchment paper overhang to lift the entire block out. With a sharp knife, slice the bars into 9 or 16 squares. A little extra lime zest sprinkled on top makes a lovely garnish! You can let them sit for a few minutes to soften slightly before eating.