While the oven is preheating, add the olive oil, miso, maple syrup, butter, mirin and vinegar to a small saucepan over medium-low heat. Whisk liquid ingredients together, and bring to a low simmer. Continue whisking for two minutes while adding in remaining glaze ingredients.
Add all vegetables (except green onions) to a large bowl. Pour warm glaze over top of the vegetables and toss them to coat.
Transfer glazed vegetables to a parchment paper lined rimmed baking sheet, and place it into the preheated oven. Roast vegetables for 35-40 minutes or until fork tender.