The buttery, herb-infused mushrooms are so delicious in this jaffle. Some things just go together and mushrooms, butter, herbs and cheesy polenta are some of those things.
Place the milk in a large cast-iron or heavy-bottomed saucepan over medium heat and bring to a simmer. Whisk in the polenta in a steady stream. Reduce the heat to low and cook the polenta for 10 minutes, whisking constantly. When the polenta is smooth and cooked through, whisk in half the butter, followed by the Parmigiano Reggiano. Fold in the herbs and finally stir in