Crush the cookies between two sheets of wax paper with a heavy rolling pin.
Place in 10.5" springform pan and sprinkle melted butter over top, mix well and push into pan. Set aside.
CHEESECAKE:
Beat cream cheese until smooth, then add Greek yogurt and sugars.
Add eggs, one at a time, clearing after each addition and scraping bowl with spatula.
Blend in pumpkin and spices, scrape the sides of the bowl, then add the cream.
Pour into pan with Biscoff cookie base, and bake for 90 minutes or until the center just sets. Do not overcook the cheesecake or it will pull away from the pan.
Once cheesecake is cooked, let it cool, then chill in fridge for an hour or two.
DO NOT TAKE THE SIDE OFF OF THE SPRINGFORM PAN OR RUN A KNIFE AROUND THE CHEESECAKE!
CHOCOLATE MOUSSE:
Follow directions to make mousse (see notes), but make it when the cheesecake has been refrigerated for one or two hours.
Once the mousse is ready, pour it onto the cheesecake and freeze for at least 12 hours; I freeze it overnight. When you are ready to finish the dessert, prepare the ganache. (Remember the dessert is frozen, so plan to have it in the fridge for at least 8 hours before serving.)
GANACHE:
Place cream and chocolate in a small pan together, then heat over low temperature until the chocolate is melted and is very smooth and shiny.
Remove the dessert from the freezer and run a very thin knife around the inside of the springform pan, then release the side and remove carefully. Place the dessert on a serving platter, plate or tray.
Pour the ganache quickly onto the center of the cake, then tip the cake from side to side to allow the ganache to start to run off the sides TIP: I used a strong piece of tape under the bottom of the pan to attach it to the cake plate so it wouldn't slip.
Do not touch the ganache with any utensil or tool, or it will not have a smooth finish. Refrigerate the dessert until ready to serve, or you can do a few more things to really make it look top-notch such as piping buttercream around the base and topping with a rose, and/or some chocolate leaves.
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