Preheat oven to 350ºF. Lightly grease an 8-inch tart pan with a removable bottom.
In a bowl, combine the crushed pretzels, coconut oil and maple syrup. Stir until completely combined. Press the crust into the prepared pan and bake for 10-12 minutes until golden around the edges and firm.
Let the pretzel crust cool while preparing the filling.
In a different bowl, whisk together the peanut butter, maple syrup, coconut oil, vanilla extract, and salt. Pour the filling into the pretzel crust and place in the refrigerator to set.
Once the filling has set, make the chocolate ganache. Place the chocolate into a small bowl. Heat the coconut milk until simmering (or about 20-30 seconds in the microwave) and pour over the chocolate. Let sit for one minute, and then whisk until smooth.
Pour the chocolate ganache over the peanut butter filling. Garnish as desired with peanuts, pretzels, and sea salt. Let chocolate cool completely, about 1 hour, before slicing and serving.