Stuffed White Mushroom Caps

Heat a large saucepan over medium heat. Add the olive oil and carefully add the thyme bundle. Once it crackles and becomes crispy set aside on a paper towel to drain. Add the diced onion, and salt and pepper, to taste, and cook until tender, about 3 to 5 minutes. Add the grated garlic and cumin and lower the heat. Stir in the sliced mushrooms, and season with salt and pepper, to taste. Cook until the mushrooms are tender and most of the liquid has evaporated at the bottom of the pan, 8 to 10 minutes. Stir the vermouth into the mushrooms and cook until the flavor of the alcohol has mellowed considerably, 5 to 8 minutes. Taste for seasoning. Add the sour cream and fried thyme back to the pan. Reduce heat and allow sour cream to melt over the mushrooms. Do not overheat the cream or it will separate. Stir in half of the grated Parmesan. Taste for seasoning.