Mediterranean Stuffed Portabella Mushrooms

Ingredients

• 1 lb portabella mushroom cap
• 1/4 cup onion , finely chopped
• 1/4 cup celery , finely chopped
• 1/4 cup carrot , finely chopped
• 1/4 cup zucchini , shredded
• 1/4 teaspoon italian seasoning
• 4 garlic cloves , minced
• cooking spray
• 3 cups croutons
• 1/2 cup vegetable broth
• 2 ounces feta cheese , crumbled
• 3 tablespoons balsamic vinaigrette
• 4 teaspoons parmesan cheese , grated
• 1/4 teaspoon black pepper
• 4 cups mixed salad greens ( I like spring mix )