Preheat the oven to 425°F (220°C).
Wash and cut the russet potatoes into fry shapes.
Soak the cut fries in water for 30 minutes. Drain and pat dry.
Toss the fries with vegetable oil and taco seasoning.
Arrange the seasoned fries on a baking sheet and bake for 30-35 minutes, flipping halfway through.
While the fries bake, prepare the cheese sauce.
Remove fries from the oven and immediately top with shredded cheddar cheese.
Return to the oven for about 5 minutes, or until the cheese is melted and bubbly.
Top with sour cream, jalapeños, and chives before serving.