01 - Preheat a grill or grill pan over medium-high heat. Season the chicken breasts generously with salt and black pepper on both sides.
02 - Place the seasoned chicken on the grill and cook for 5 to 7 minutes per side, until the internal temperature reaches 165°F and juices run clear. Transfer to a cutting board and let rest for 5 minutes before slicing thinly against the grain.
03 - In a small mixing bowl, whisk together the extra-virgin olive oil, balsamic vinegar, Dijon mustard, and honey until fully emulsified. Season with salt and pepper to taste.
04 - In a large salad bowl, combine the mixed greens, sliced strawberries, red onion, avocado, and chopped pecans. Toss gently to distribute the ingredients evenly.
05 - Arrange the sliced grilled chicken over the salad and scatter the crumbled goat cheese on top.
06 - Drizzle the balsamic vinaigrette over the salad just before serving. Toss lightly if desired, or serve with the dressing on the side.