Cook bacon in lg skillet over med-high heat until crisp. Drain on paper towels, crumble. In bowl, whisk together mayonnaise, parsley, green onion, lemon juice, worcestershire sauce, a pinch of salt and pepper.
In another lg bowl, stir together chicken, tomatoes and bacon. Pour dressing over chicken mix. Toss to coat. Serve over lettuce leaves. Garnish w/ advocado slices.