Baked Mushrooms with Miso Butter

Ingredients: 1 pound mushrooms (button, cremini, or shiitake), cleaned and halved or quartered 3 tablespoons unsalted butter, softened 2 tablespoons white miso paste 2 cloves garlic, minced 1 tablespoon soy sauce 1 tablespoon olive oil 1 tablespoon rice vinegar 1 teaspoon sesame oil 1 teaspoon honey or maple syrup 2 tablespoons chopped green onions