To create the perfect Thanksgiving Mashed Sweet Potatoes with Miso Butter, follow these easy steps:

1. Preheat your Oven: Preheat your oven to 400°F (200°C). Line a baking sheet with parchment paper.
2. Prepare the Sweet Potatoes: Peel and cut the sweet potatoes into chunks of even size for uniform cooking.
3. Roast the Sweet Potatoes: Spread the sweet potato chunks on the baking sheet. Drizzle with olive oil and sprinkle with salt. Roast in the oven for 25-30 minutes, or until they are tender and easily pierced with a fork.
4. Mash the Potatoes: Once the sweet potatoes are cooked, remove them from the oven and let them cool slightly. Then, transfer them to a large mixing bowl and mash until smooth.
5. Make the Miso Butter: In a separate bowl, mix the softened butter with the white miso paste until well combined.
6. Combine Ingredients: Add the miso butter mixture to the mashed sweet potatoes. Pour in the milk and add salt, black pepper, and ground cinnamon (if using). Stir well until all ingredients are fully incorporated and the mixture is creamy.
7. Taste and Adjust: Taste the mashed sweet potatoes and adjust the seasoning as needed with additional salt or pepper.
8. Serve Warm: Transfer the mixture to a serving bowl and, if desired, top with chopped chives or scallions as a garnish.

These simple steps will lead you to a delicious side dish that is sure to enhance your Thanksgiving dinner.