First prepare the brownie recipe & bake the batter into 2-7" round pansOne layer will be the base for the mousse cake & the other will get chunked up for the filling & the topping Prepare your 7" ring mold or springform pan with acetate cake strip then insert one brownie layer into the bottom ~ reserve in the refrigerator & then chop up the other layer into small chunks~ also reserve until you prepare the mousse
Next prepare the peanut butter mousse by whipping your aquafaba to stiff glossy peaks, reserve & then whip the vegan whipped cream to medium firm peaks
Next in a large mixing bowl slightly melt the peanut butter (either over a double boiler or in the microwave for 20-30 seconds)
Combine the plant milk with the sugar (or sugar alternative) with the agar powder in a small sauce pot & bring to a rolling boil whisking often to avoid burning the bottom
Pour the hot plant milk mixture into the peanut butter & whisk quickly until smooth, it will tighten up quickly
Add 1 cup of the whipped cream & whisk vigorously to lighten the peanut butter mixture then add all of the whipped aquafaba & last add the remaining whipped cream
Fold in the chopped pretzels & brownie chunks then pour into your prepared ring mold with the brownie base.
Freeze for 1 - 2 hours until completely set then top with the melted ¼ cup of peanut butter & ganache drizzles & remaining pretzels and brownie chunks
Refrigerate until serving