Prep the ingredients per the instructions above.
Season the chicken well on both sides with salt and pepper and drizzle with oil.
Preheat the grill on medium heat.
Grill the chicken well on both sides to an internal temperature of 160℉ (71℃) using a thermometer. Once cooked, set aside to rest for 5 minutes before dicing into bite sized pieces.
Make the dressing: In a small bowl, whisk together all the ingredients until thick and emulsified. Season with salt and pepper to taste.
Toast the bread then spread it with butter.
Make the spritzer: Combine all the ingredients. Serve over ice if desired.
Top the greens with blueberries, pistachios, red onion, cheese, chicken, and cucumber, then drizzle with the dressing.
Serve the salad with bread and spritzer.