Balsamic Stuffed Mushrooms - Bertolli

Ingredients

• 30 large white button mushrooms (about 1-1/4 pounds)
• 1/2 cup chopped pancetta
• 1 medium onion, (finely chopped)
• 2 cloves garlic, (finely chopped)
• 2 cups lightly packed baby spinach leaves, (finely chopped)
• 1 jar (24 ounces) Bertolli® Traditional Marinara with Italian Herbs & Fresh Garlic Sauce
• 1/4 cup plus 2 tablespoons grated Parmesan cheese, (divided)
• 1/2 cup plus 2 tablespoons seasoned panko bread crumbs, (divided)