Cook the orzo pasta according to package instructions. Drain and set aside to cool.
In a small bowl, whisk together olive oil, lemon juice, oregano, garlic powder, salt, and pepper.
Place chicken breasts in a resealable bag or shallow dish and pour the marinade over them. Let marinate for at least 30 minutes.
Preheat the grill to medium-high heat. Grill the chicken for about 6-7 minutes per side or until fully cooked and juices run clear. Remove from grill and let rest for 5 minutes before slicing.
In a large bowl, combine the cooled orzo, diced avocado, cherry tomatoes, red onion, and parsley. Toss gently to combine.
In a separate bowl, mix together the crumbled bacon, mayonnaise, honey, Dijon mustard, apple cider vinegar, salt, and pepper to create the dressing.
Drizzle the honey mustard bacon dressing over the orzo salad and toss to coat evenly.
Top the salad with sliced grilled chicken and serve immediately.