Prep Your Pan & Oven: Start by preheating your oven to a cozy 350°F (175°C). Grab an 8x8 or 9x9 inch baking pan and line it with parchment paper, making sure to leave some overhang on the sides – this makes lifting your bars out super easy later!
Whip Up the Healthy Crust: In a spacious mixing bowl, combine the crushed whole-grain graham crackers, whole wheat flour, coconut sugar, and your melted butter. Stir everything together until it's nicely combined and looks like moist crumbs.
Bake the Golden Base: Press this crumb mixture firmly and evenly into the bottom of your parchment-lined pan. Pop it into the preheated oven for 15 minutes, just until it's lightly golden. While your crust bakes, get ready for the zesty filling!
Create the Creamy Lime Filling: In another large bowl, whisk together the sweetened condensed milk, full-fat coconut milk, plain Greek yogurt, fresh lime juice, and vibrant lime zest. Keep whisking until the mixture is perfectly smooth and lump-free.
Combine & Bake Again: Carefully pour your dreamy lime filling over the warm, baked crust. Slide the pan back into the oven and bake for another 15 minutes, or until the edges of the filling are just set.
Add Topping & Chill for Perfection: As soon as you take the bars out of the oven, generously sprinkle the lightly sweetened shredded coconut over the warm filling. Let the bars cool down on a wire rack, then transfer them to the refrigerator to chill for at least 2 hours. This chilling step is essential for firm, easy-to-slice bars!
Slice and Savor: Once your bars are thoroughly chilled and firm, use the parchment paper overhang to gently lift the entire slab from the pan. Place it on a cutting board, slice into neat squares or rectangles, and enjoy your refreshing, healthy summer treat!