Preheat the oven to 350°F (175°C).
Boil sweet potatoes until fork-tender.
Drain, cool, peel, and mash the sweet potatoes until smooth.
In a bowl, combine mashed sweet potatoes with butter, sugar, eggs, spices, cocoa, and cream. Mix until smooth.
Pour the mixture into unbaked pie crusts, spreading it evenly.
Bake for 45-50 minutes until the filling is set and the crust is golden brown.
Allow pies to cool, then garnish with whipped topping and a sprinkle of cinnamon before serving.