2 large sweet potatoes (about 9 ounces each), peeled and diced
Cooking spray
1 small onion, diced
2 cloves garlic, minced
1.25 pounds lean ground turkey
14.5-ounce can diced tomatoes
16-ounce bag frozen mixed vegetables (carrots, corn, peas and green beans)
1 tablespoon yellow mustard
2 tablespoons Worcestershire sauce
1/4 teaspoon ground black pepper
2 teaspoons corn starch
1 tablespoon cold water
2 tablespoons trans-fat free margarine