Yes, sunflower oil can be used as a substitute for olive oil in this recipe. Olive oil provides some flavor to the dish with its grassy notes, but sunflower oil will work fine as a neutral-tasting vegetable oil. It may result in a slightly different flavor, but the gratin should turn out similarly in terms of texture and cheese melt. You can also use other neutral oils like canola or vegetable oil as an alternative to olive oil in this recipe.
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