Let the cheese melt, undisturbed, until bubbling and lightly golden around the edges. Place a flour tortilla directly on top of the melted cheese, gently pressing so it adheres. Cook for 1 to 2 minutes, until the cheese forms a deep golden, crispy crust. Using a spatula, carefully lift the tortilla—the cheese should be fully attached and crisp on the outside. Transfer to a plate, cheese-side up, and repeat with remaining tortillas.