Well, you can use any temperature from 350 0F to 400 0F to cook garlic bread. 350 0F takes much longer, whereas 400 0F is very quick and ideal for thin slices. But if you are using French baguette-style bread,( like I used here) 400 0F will not work best. The garlic toast will brown way before the interior softens and absorbs the garlic butter. That is why I recommend using the temperature of 3700F to cook garlic bread in an air fryer.