Heat tortillas according to instructions on package and keep warm.
Coat a large nonstick skillet with cooking spray. Heat onion until translucent. On a medium-high heat, cook beef until no longer pink. Stir in chili powder and cumin, followed by tomato sauce or water, and cook for a further 2-3 minutes.
Divide beef among warmed tortillas and top with cheese, salsa, sour cream and onions.
Serves 4.
Per Serving with cheese: Calories 218, Calories from Fat 65, Total Fat 7.2g (sat 3.3g), Cholesterol 57mg, Sodium 157mg, Carbohydrate 16.2g, Fiber 3.1g, Protein 22.1g
Per Serving without cheese: Calories 199, Calories from Fat 53, Total Fat 5.8g (sat 2.4g), Cholesterol 52mg, Sodium 99mg, Carbohydrate 16g, Fiber 3.1g, Protein 20.4g
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