Drizzle 2 teaspoons of olive oil into a small nonstick frying pan and heat over medium-high heat.

Place one round cheddar cheese slice into the pan. Cook until it bubbles and browns at the edges, about 4–5 minutes, and begins to turn crisp.

Remove the pan from the heat and let the cheese rest in the pan for 2–3 minutes. It will firm up as it cools.

Carefully lift the cheese from the pan with a spatula. Leave it flat on a plate for a crisp round.

For a hard taco-shell shape, drape the cheese over a wooden spoon so the sides hang down. Let it set crisp before adding toppings.