Wash and cut the potatoes into evenly sized wedges so they cook at the same rate.
Toss them with olive oil, salt, and pepper in a bowl until well coated.
Spread them out on a baking sheet in a single layer.
Preheat your oven to 400°F (200°C).
Roast the potatoes for about 35 minutes, flipping them halfway through.
They should become crispy on the outside and tender inside.
While the potatoes are roasting, combine goat cheese, olive oil, lemon juice, garlic, Dijon mustard, grainy mustard, salt, and pepper in a bowl.
Stir until smooth and creamy.
Taste and adjust seasoning if needed.
Once the potatoes are done, transfer them to a serving bowl while still hot.
Pour the goat cheese dressing over the warm potatoes.
Toss gently so the cheese melts slightly and coats every piece.