Broccoli Stuffed Shells

• 18 shell macaroni (jumbo)
• 13 nonstick baking (pan)
• 9 by
• 3 egg whites
• 2 garlic (cloves)
• 250 gr nonfat ricotta cheese
• 200 gr broccoli (chopped)
• 120 ml tomato sauce on bottom
• 85 gr mushrooms (chopped)
• 60 ml vegetable broth