Preheat your oven to 400°F (200°C).
In a small bowl, combine olive oil, Dijon mustard, garlic, salt, and black pepper.
Brush each lamb chop with the mustard mixture, ensuring they are well coated.
Press the finely chopped pistachios onto both sides of each lamb chop, creating a crust.
Place the lamb chops on a baking sheet lined with parchment paper.
Bake in the preheated oven for 15-20 minutes, or until the lamb chops reach your desired level of doneness.
Remove from the oven and let the lamb chops rest for a few minutes before serving.