Pull the chicken meat from the bones, discarding the skin. Cut the meat into bite-sized pieces and transfer to a large salad bowl.
In a small bowl, combine the mustard and lemon juice and whisk to blend. Gradually whisk in the olive oil. Mix in the basil, shallot and chipotle with its sauce. Season the dressing to taste with salt and pepper. Mix 1/4 cup of the dressing into to chicken and let it marinate while preparing the remaining ingredients.
Stir the cucumbers, tomatoes, and bell pepper into the chicken. Mix in the lettuce. Add enough dressing to lightly coat the ingredients, Taste and adjust the seasoning. Gently mix in the avocado and serve.
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