Preheat the oven to 400º F.
If you're using baby sweet potatoes, cut them in half lengthwise. If you're using regular sweet potatoes, cube them into bite-size pieces or slice them into ¼ to ½-inch thick rounds.
Place the sweet potatoes into a large mixing bowl; set aside.
In another bowl, whisk together the olive oil, miso paste, honey, rice vinegar, and soy sauce. Drizzle over the sweet potatoes, sprinkle with sesame seeds, and toss until coated.
Place a sheet of tin foil over a baking sheet (optional, but less mess!) and transfer the sweet potatoes to the baking sheet.
Roast in the oven for 25-30 minutes or until fork tender.
Drizzle with a bit of sesame oil, garnish with sliced scallions, and serve.
