Preheat your grill to medium-high heat.
Season the chicken breasts with salt and pepper, then brush lightly with olive oil.
Grill the chicken for about 6-7 minutes on each side, or until fully cooked (internal temperature should reach 165°F).
Remove the chicken from the grill and let it rest for 5 minutes before slicing.
In a bowl, toss the salad greens, cherry tomatoes, cucumber, and red onion together.
Drizzle the ranch dressing over the salad and toss to combine.
Slice the grilled chicken and place it on top of the salad.
Drizzle the buffalo sauce over the chicken and sprinkle with blue cheese crumbles.
Serve immediately.