Place 1 cup of yogurt, basil, parsley, chives, lemon juice, honey and pepper in a blender or food processor. Cover and pulse until smooth (dressing will be green in color). Pour yogurt mixture into a medium bowl; stir in remaining yogurt and mayonnaise until just blended; refrigerate until ready to serve.
For Salad
Place lettuce at the bottom of a bowl and sprinkle the tomatoes, onion, cucumber, turkey, bacon bits, egg and Colby cheese on top. Just before serving, pour dressing over salad and toss lightly.
Notes
Dressing may be prepared up to 2 days ahead and stored in an airtight container in the refrigerator.