Combine the coconut milk, sugar, and salt in a small saucepan. Place it over medium-low heat and simmer, uncovered, until it has reduced to 3/4 cup. Please note that this took about 75 minutes; so, plan for between 60-90 minutes. If you accidentally over-reduce it, just add more cold coconut milk to make ¾ cup and warm it up on the stove. Stir in the vanilla extract and keep it warm.
Meanwhile, preheat your oven to 350 degrees Fahrenheit (176 degrees Celsius).
Place the graham cracker crumbs in a 9x9 glass baking dish. Pour the melted coconut oil over the top, then use a fork to stir it together and press it firmly into the bottom of the pan.
Pour the prepared condensed coconut milk over the top of the crumb base. Scatter the layers of chocolate, walnuts, and coconut evenly over the top. Press the ingredients down using the fork.
Bake, uncovered, for 30 minutes. Allow it to cool for 15 minutes, then run a butter knife around the edges to help loosen it from the pan. Let it rest until it is cool enough to handle. Cut the pan into 8 rectangles.
Notes
Storage Info:To store Vegan Magic Cookie Bars, let them cool completely, then cut them into rectangles. Store the bars in an airtight container in the refrigerator for up to 5-7 days. For longer storage, you can freeze them for up to 2-3 months; ensure they're well-wrapped in plastic wrap and placed in a freezer-safe container.