Rub the potatoes with the olive oil and season with salt and pepper.
Bake, cut side down on a rimmed baking sheet until golden brown and tender, between, 18-25 minutes, depending on the size of the potatoes. Turn the oven to broil, combine the cheeses in a small bowl. Turn the potatoes cut side up and top with the cheese mixture, dividing evenly. Broil until cheese is melted and golden brown. Serve warm.