Add coconut cream and dark chocolate to mixing bowl and microwave in 30-second increments until melted, stirring occasionally to incorporate. Be careful not to overheat or the chocolate can lose its creamy texture. (Alternatively, melt in a small saucepan over medium-low heat, stirring occasionally. Then transfer to a mixing bowl.)
Use a whisk to gently stir the mixture until it's completely incorporated and smooth (see photo). Set in the refrigerator uncovered to chill for 2-3 hours, or until mostly firm and it holds its shape when tipped sideways.
In the meantime, preheat oven to 325 degrees F (162 C).
To a medium mixing bowl, add pretzel meal, sugar, add melted butter. Stir to thoroughly combine - it should be moist and moldable - add more melted butter (1-2 Tbsp // amount as original recipe is written // adjust if altering batch size) if too dry and crumbly.
Transfer mixture to a standard 9-inch pie pan (adjust number/size of pan if altering batch size) and use hands to form a uniform crust, working it all the way up the edges of the pan.
Bake for 12-14 minutes, or until firm to the touch and slightly browned on the edges. Set aside to cool.
Once the filling is chilled and mostly hardened (again, it shouldn't run when tipped sideways), use a mixer on high to whip and incorporate air for about 1 minute, scraping down sides as needed.
Add peanut butter and mix once more.
Sample and add sweetener to taste. If you prefer a more bittersweet chocolate pie, you may not need any. I added 2-3 Tbsp maple syrup and 3-5 Tbsp organic powdered sugar (amounts as original recipe is written // adjust if altering batch size).
Mix until well incorporated, then transfer to the cooled pretzel crust and smooth the top with a spoon.
Cover loosely with plastic wrap and let chill for another 2-3 hours, or overnight. The longer it chills, the firmer the mousse filling becomes.
To serve, top with coconut whipped cream, peanut butter, crushed peanuts, and/or crushed pretzels (optional). Leftovers keep covered in the refrigerator for 3-4 days, though best within the first 1-2 days.
Notes
*I haven't tried this pie with full-fat coconut milk, but suspect it would work! I do recommend using coconut cream if possible. *Nutrition information is a rough estimate calculated with lesser amount of powdered sugar. *Pretzel crust method adapted from Michael Symon. *Mousse filling inspired by Oh She Glows.