Clean the mushrooms with a dry paper towel or a brush to remove any dirt. Do not soak them in water, as the mushrooms may absorb too much liquid.
Cut the cremini mushrooms in half or into quarters, and the oyster mushrooms into larger pieces so they are easy to grill.
In a bowl, combine the olive oil, finely chopped garlic, fresh rosemary and thyme, salt, pepper, and balsamic vinegar.
Toss the mushrooms in the oil mixture and let them marinate for 10 minutes to allow the flavors to meld.
Preheat the grill to medium-high heat, and if necessary, grease the grill grates with a little oil to prevent the mushrooms from sticking.
Place the mushrooms on the grill and cook for about 4-5 minutes per side, until browned and slightly caramelized.
Turn the mushrooms occasionally while grilling to ensure they cook evenly on all sides.
Once the mushrooms are cooked, drizzle with a little extra balsamic vinegar before serving for a more intense flavor.
Serve warm as a side dish or as a standalone dish as part of a light summer barbecue.
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