Goat Cheese Stuffed Mushrooms

Bahan-bahan (4 porsi)

• 8 large fresh mushrooms
• 1 tablespoon unsalted butter
• ¼ cup finely chopped onion
• 4 ounces crumbled goat cheese
• ½ teaspoon chopped fresh thyme
• ¼ teaspoon salt
• 1 dash pepper
• 3 tablespoons extra virgin olive oil