Season the chicken breast with salt, black pepper, and a pinch of garlic powder.
Heat a grill or grill pan over medium-high heat and lightly coat with oil spray.
Grill the chicken for 6 to 7 minutes per side or until the internal temperature reaches 165°F.
In a small bowl, whisk together the olive oil, apple cider vinegar, Dijon mustard, and honey to create the dressing.
In a large mixing bowl, combine the shredded cabbage and carrots.
Pour the dressing over the vegetables and toss thoroughly to ensure everything is evenly coated.
Once the chicken is cooked, let it rest for 3 minutes before slicing it into thin strips.
Place the slaw on a plate, top with the grilled chicken strips, and sprinkle with pumpkin seeds for a final crunch.