Spaghetti with Caramelized Onions, Mushrooms and Pancetta

Bahan-bahan (4 porsi)

• 8 ounces uncooked spaghetti
• 1 tablespoon olive oil
• ¼ cup (about 1 ounce) chopped pancetta or bacon
• 6 cups (about 3 large onions) sliced sweet onions
• ½ teaspoon salt, (divided)
• ¼ teaspoon pepper, (divided)
• 6 cups (about 1 pound) sliced mushrooms
• 2 teaspoons minced fresh oregano ((or ½ teaspoon dried))
• ¼ cup chopped fresh parsley, (divided)
• 3 medium garlic cloves, (minced)
• ½ cup low salt chicken broth
• fresh oregano, (optional)