Mix first 4 ingredients in small bowl. Place tuna in medium bowl and sprinkle with taco seasoning. Heat oil in heavy medium skillet over medium-high heat. Add tuna; saute to desired doneness, 3 minutes for medium. Reduce heat to medium-low. Stir in sour cream mixture. Cook just until heated through, stirring frequently, about 2 minutes ( do not boil).
Heat taco shells in microwave 20 seconds. Fill taco shells with tuna mixture.
Serves 4
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