- Preheat your grill to medium-high heat. In a small bowl, mix together garlic powder, onion powder, smoked paprika, salt, and pepper. Rub the spice mixture onto both sides of the chicken breasts. 
- Drizzle olive oil over the seasoned chicken breasts and place them on the grill. Cook for about 6-7 minutes on each side or until the internal temperature reaches 165°F. Remove from the grill and let rest for 5 minutes before slicing. 
- In a large salad bowl, combine the mixed greens, blueberries, feta cheese, sliced almonds, and red onion. 
- Slice the grilled chicken and arrange it on top of the salad. Drizzle with balsamic vinaigrette and toss gently to combine. 
- Serve immediately and enjoy your fresh and vibrant salad!