Cook couscous according to the instructions on the package. Should take no more than 10 minutes. Set aside to cool.
Whisk together the ingredients for the vinaigrette in a bowl or cup and whisk until emulsified.
Add all ingredients for the salad to a bowl and gently toss and fold everything together. Season to taste with sea salt & pepper.
Add chicken to a bowl along with the rest of the ingredients.
Massage the seasoning onto the chicken, then cover and let it marinate at room temperature for about 20 minutes.
Set a nonstick skillet on medium-high heat, and once hot spray with oil, then add the chicken. Cook for about 6 minutes per side, or until you see sear marks along the edges.
Serve and enjoy with the Dijon Tarragon Couscous Salad!