01 - In a large bowl, whisk together the olive oil, balsamic vinegar, minced garlic, dried thyme, dried rosemary, salt, and black pepper until well combined.
02 - Add the cleaned mushrooms to the marinade and toss thoroughly to coat evenly. Let them rest for 10 minutes while you prepare the grill.
03 - Preheat an outdoor grill or grill pan to medium-high heat. Thread the mushrooms onto skewers or arrange them in a grill basket for easier handling.
04 - Place the mushrooms on the grill and cook for 3 to 4 minutes per side, until tender with distinct grill marks. Baste occasionally with any remaining marinade.
05 - Melt the butter in a large skillet over medium heat. Add the grilled mushrooms and sauté for 2 to 3 minutes, stirring occasionally, until fragrant and lightly browned.
06 - Remove from heat, sprinkle with fresh chopped parsley, and adjust seasoning with salt and pepper as needed. Serve warm with lemon wedges on the side.