In medium saucepan, whisk milk and cornstarch together until smooth. Cook over medium heat, stirring constantly, until mixture thickens. Stir in cheeses. Lower heat to medium-low and continue cooking, stirring frequently, until cheese is melted and the mixture is very smooth, about 5 minutes. Stir in tomato, onions and jalapeño and continue to cook, stirring frequently, until flavors blend, about 5 minutes more. Sprinkle with chili powder and serve hot.
Per Serving:110 calories (70 from fat), 8g total fat, 4.5g saturated fat, 25mg cholesterol, 150mg sodium, 3g carbohydrates, 7g protein.
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