Sautéed Mushrooms and Onions

Bahan-bahan (4 porsi)

• 3 tablespoons butter
• 1 large sweet onion (cut into ¼" slices)
• 2 cloves garlic (minced)
• ¼ cup white wine (optional)
• 12 ounces mushrooms (cut in half if small or ½-inch slices if large)
• 1 tablespoon soy sauce
• ½ tablespoon chopped fresh parsley