Wash and dry the russet potato, then cut it in half lengthwise and slice each half into wedges; pat the wedges dry with paper towels.
Place the wedges in a mixing bowl and drizzle with 1 1/2 teaspoons olive oil; toss to coat evenly.
In a small bowl, combine 1/2 teaspoon garlic powder, 1/2 teaspoon onion powder, 1/2 teaspoon paprika, 3/8 teaspoon sea salt (from 1/4 + 1/8 teaspoon), and 1/4 teaspoon ground mustard.
Add the spice mixture to the potato wedges and toss thoroughly so each wedge is evenly coated.
Arrange the wedges in a single layer in the air fryer basket and cook at 400°F for about 20 minutes, until crispy and golden brown, shaking or turning once halfway through if needed.
Serve immediately.