Heat oil in stockpot over medium heat until hot. Add onion, jalapeño pepper and garlic; cook 5 to 7 minutes or until onion is tender, stirring occasionally.
Stir in beef Brisket, chiles and tomatoes; bring to a boil. Reduce heat; cover and simmer 20 minutes to develop flavors, stirring occasionally. Remove from heat. Stir in 2 tablespoons sour cream.
Garnish with additional sour cream, tortilla chips, cheese, avocado or guacamole, if desired.
Nutrition information per serving: 282 Calories; 72 kcal Calories from fat; 8 g Total Fat; 3 g Saturated Fat; 3 g Monounsaturated Fat; 88 mg Cholesterol; 850 mg Sodium; 21 g Total Carbohydrate; 8.2 g Dietary Fiber; 30 g Protein; 3.4 mg Iron; 7.4 mg Niacin; 0.4 mg Vitamin B6; 2.1 mcg Vitamin B12; 6.9 mg Zinc; 29.5 mcg Selenium; 110.1 mg Choline;