Mix Cornstarch And 3/4 Cup Broth. Mix Remaining Broth, Oregano, Garlic, Broccoli, Carrots And Onion In Saucepot. Heat To A Boil. Cover And Cook Over Low Heat 5 Minutes Or Until Vegetables Are Tender. Add Cornstarch Mixture. Cook And Stir Until Mixture Boils And Thickens. Stir In Tomato. Toss With Spaghetti And Serve With Cheese.