Heat oven to 325°F. Heat taco shells as directed on package.
Meanwhile, in 10-inch nonstick skillet, heat oil over medium-high heat until hot. Add chicken and garlic; cook and stir 2 to 4 minutes or until chicken is no longer pink in center.
Stir in taco seasoning mix and lime juice. Reduce heat to medium-low; cook 1 to 2 minutes or until thoroughly heated, stirring occasionally. Remove from heat.
Spoon chicken mixture into taco shells. Top each with salad greens, tomato and cheese. Serve tacos with salsa and sour cream.