Preheat the oven to 350°F (180°C), and line an 8x8-inch square pan with parchment paper.
In a bowl, add the graham cracker crumbs and melted vegan butter. Mix together until combined.
Pour it into your pan and press it in with your fingertips or the bottom of a measuring cup so that it forms an evenly flat layer.
Over the graham cracker layer, sprinkle on the chocolate chips. Make sure to spread them out evenly.
On top of the chocolate chips, add an even layer of pecans.
Add a layer of coconut flakes and lightly press down to make sure the surface is flat.
Pour a can of sweetened condensed oat milk over the coconut. Try to pour evenly, making sure to get the edges and corners. You can use an offset spatula or the back of a spoon to gently push the condensed milk to the sides if needed.
Sprinkle some flaky sea salt on top, and bake in the preheated oven for 30 minutes.
Once baked, take it out of the oven and let it come to room temperature before putting it in the fridge to chill for at least an hour before you slice and serve.