The absence of a dehydrator is not a reason to give up such a pleasure as homemade banana chips. They can be cooked in the oven. To do this, cover a baking sheet with parchment and lightly grease it with oil (sunflower, peanut or coconut oil are suitable - with the latter, the chips will have an interesting tropical flavor and aroma). Arrange the banana slices on a baking sheet in one layer. Turn the oven to 135F (60 C) and dry the bananas for 6-10 hours. Don't forget to turn the slices over from time to time and check if they are ready.