In a mixing bowl, combine the olive oil, balsamic vinegar, mustard, honey, garlic powder, salt and pepper. Whisk vigorously until well fully incorporated. Set aside.

Over medium-high heat, give the chicken breast a light sprinkle of salt and pepper, then sauté in 1 tbs olive oil for 3-4 minutes on each side, depending on the thickness of chicken. Let rest for 3-5 minutes before slicing.

To make the salad, top the mixed greens with walnuts, blueberries, strawberries, orange segments, cheese and sliced chicken. Serve balsamic dressing alongside salad.