Prepare the couscous according to package instructions.
Combine the ingredients for the honey mustard lemon vinaigrette and whisk well to emulsify.
If your chicken is not warm, cover with a damp paper towel on a microwave safe plate and microwave for 1 minute or until warm. This will ensure the chicken is able to take on the flavor of the vinaigrette.
Fluff the cooked couscous with a fork, in a raking motion. Combine the couscous, chicken, peas, onions, and basil. Pour the vinaigrette over the couscous mixture and stir to combine. Let the vinaigrette soak in for about 3-5 minutes and serve immediately.
NOTE- if you are planning on serving this later or taking it to a potluck or party keep the couscous and the vinaigrette separate until right before serving time.