Prepare the Pistachio Base: Line an 8x4 inch loaf pan or a small square baking dish with parchment paper, leaving an overhang on the sides for easy removal.
Combine INGREDIENTS : In a food processor, pulse the shelled pistachios until they form a coarse, crumbly meal. Add 2 tablespoons of melted coconut oil, the sugar-free sweetener, vanilla extract, and an optional pinch of sea salt. Process again until the mixture comes together and feels slightly sticky when pressed between your fingers.
Press into Pan: Evenly press the pistachio mixture into the bottom of the prepared pan. Use the back of a spoon or your fingers to flatten it into a firm, compact layer.
Chill the Base: Place the pan in the refrigerator for at least 30 minutes to allow the pistachio base to firm up.
Melt the Chocolate: While the base is chilling, gently melt the sugar-free milk chocolate chips. You can do this in a microwave (heating in 30-second intervals, stirring well each time) or in a double boiler. If the chocolate seems too thick, stir in the extra 1 teaspoon of melted coconut oil to make it smoother.
Coat and Chill: Once the pistachio base is firm, pour the melted chocolate evenly over the top. Gently spread it to cover the entire surface.
Final Chill: Return the pan to the refrigerator for at least 1 hour, or until the chocolate layer is completely set and hard.
Slice and Serve: Use the parchment paper overhang to lift the entire slab out of the pan. Place it on a cutting board and slice it into 8 bars. Enjoy your healthy, crunchy summer treat!