First make the peanut butter cookie recipe for the base by greasing & parchment lining a 9" x 9" square cake pan & preheat the oven to 350℉
Cream the vegan butter with the peanut butter & the sugar to smooth, no need to get it light & fluffy, just well incorporated
Sift the flour, baking soda, salt & egg replacer together then add it all at once to the creaming mixture, it will not come together to a soft dough but rather a crumbly mixture
Add the plant milk & vanilla extract, then you will see the dough come together instantly
Press the dough evenly into the prepared cake pan & bake in the preheated oven for approximately 30 minutes or when golden & puffed and no raw dough in the center
Once the cookie base has cooled completely turn it out onto a large cutting board
Do not start the marshmallow until the cookie base has come out of the oven
In a medium sized sauce pot over medium to high heat combine the water, granulated sugar, corn syrup & agar stirring to dissolve the sugar
Once the solution comes to a boil stop stirring & increase the heat to high
Insert an instant read thermometer & continue boiling until it reaches 240°F
About 5 minutes before the temperature of the sugar syrup reaches 240°F start whipping the aquafaba with the cream of tartar with the balloon whip attachment of a stand mixer *see notes for success above!
Whip to stiff peaks and then start pouring in the sugar syrup very carefully and slowly!
See video visual on the Snowball Cakes video for how to do this!Continue whipping the marshmallow until all the hot syrup is incorporated then add the vanilla extract
Quickly spread the thick vegan marshmallow over the peanut butter cookie base & drizzle with vegan ganache & chopped peanuts
Cut into desired portions.