Preheat oven to 350 F.
Grease a 8x8 round pie pan with a bit of coconut oil.
In a medium bowl, use a fork or your hands to mix together the crust ingredients until it becomes a sticky dough.
Press the dough into the pie pan, making sure to cover all of the sides evenly. Then, use a glass to press the dough into the bottom of the pan firmly to make sure it's compact. You don't want there to be any cracks.
Bake the pie crust for about 15 minutes, until the top is just lightly browned. Allow the pie crust to cool completely before you pour in the filling.
Place a medium saucepan on the stove over low heat. Pour in the coconut milk and cornstarch, and whisk them together until smooth and warmed through, about 5 minutes.
Add in the peanut butter, maple syrup, and vanilla, and whisk again until the mixture is smooth.
Now, add in the baking chocolate. Stir the mixture together again and allow the baking chocolate to slowly melt and become smoothly incorporated into the liquid.
Whisk in the cocoa powder and salt. Continue whisking for about 10 minutes until the mixture is warmed through.
Allow the mixture to cool slightly, and then pour it into the pie crust.
Refrigerate the pie for about 8 hours, or overnight.
When it's time to serve, spoon the whipped topping on top of the pie and smooth it down toward the sides. Dust the pie with cocoa powder and sprinkle the chopped peanut butter cups on top.
Serve cold.