Prepare the Sweet Potato Topping:
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- Preheat the oven to 420°F.
- Rinse the sweet potatoes and place them in a large pot. Add water to cover.
- Boil for about 25 minutes, or until soft and fork-tender.
- Let cool slightly, then peel the skin off, chop the flesh, and place in a bowl.
- Add Greek yogurt and cinnamon (if using), and mash with a potato masher or hand mixer until smooth and fluffy. Set aside.