Preheat oven to 450F. Prick sweet potato with fork and bake in preheated oven for 1 hour, or until soft. Remove from oven and let cool.
When the potato is slightly over halfway done, heat oil in a large saucepan over medium heat. Add onion and sauté, 2-3 minutes, until soft. Add garlic and cook for 30 seconds.
Add rice, stirring to coat with oil. Sauté for 3-5 minutes, stirring occasionally, until the rice begins to toast or the pan becomes dry.
Reduce heat to medium-low, and add the wine. Cook, stirring often, until the wine is absorbed.
Add the stock, ⅓ c at a time, stirring often, and adding more as the previous addition is absorbed.
While the risotto is cooking, peel your baked sweet potato and mash with nutmeg, paprika, salt, and pepper.
Once the risotto is cooked and chewy to your liking, reduce the heat to low and add Parmesan cheese. Stir until well incorporated. Then, mix in the mashed sweet potatoes.