Trim excess fat from the chicken thighs if desired.
Toss the chicken with taco seasoning, chipotle powder, and olive oil until evenly coated.
Heat a large skillet or grill pan over medium-high heat.
Cook the Chipotle Chicken with Pistachio Sauce chicken for 5–7 minutes per side, or until the internal temperature reaches 165°F (74°C).
While the chicken cooks, pulse the pistachios, cilantro, and chives in a food processor until finely chopped.
Transfer the herb mixture to a bowl.
Fold in the diced avocado, lemon zest, lemon juice, olive oil, and salt.
Stir gently to keep the avocado slightly chunky.
Slice the cooked chicken into bite-sized pieces.
Spoon the chunky pistachio sauce generously over the chicken.
Serve immediately with rice, quinoa, roasted vegetables, or a fresh green salad.