Preheat the oven to 350 degrees F. Line a 9x13 inch baking dish* with parchment paper allowing the side to hang over the dish.
In a large mixing bowl or bowl of a stand mixer, combine the butter, brown sugar, salt, and 2 teaspoons vanilla. Using a mixer beat the mixture until it is smooth, scraping down the sides a few times. Add the flour and water, beat until combined.
Press the dough into the prepared baking pan. Bake for 15 minutes or until the crust is lightly golden. Remove from the oven. The bars will seem buttery, this is fine.
Meanwhile, make the "caramel". Add the butter to a medium sauce pan. Cook butter over medium heat until lightly toasted, about 3 minutes. Add the sweetened condensed milk and maple syrup. Cook the sauce over low heat for 8-10 minute, stirring often to prevent the caramel from burning and sticking to the pan*. Cook until it thickens slightly and turns light golden in color. Remove from the heat and stir in 1 teaspoon vanilla.
Once the cookie base is out of the oven, sprinkle the top of the cookies with chopped chocolate or chocolate chips. Next, sprinkle on the walnuts and 1 cup shredded coconut. Pour the "caramel" over top of everything in an even layer. If needed, use a spoon to gently spread the caramel into an even layer. Sprinkle the top with the remaining coconut. Bake for 20-25 minutes or until the top is beginning to brown and caramelize.
Allow the bars to cool about 20 minutes and then slice and serve warm.