Peel as many bananas as you would like to dry. Cut them into 1/4-inch slices.
Arrange the banana slices on the bottom part of the halogen oven bowl. Place any remaining slices on the tray that came with your halogen oven and slide it in place.
Set the oven for 400 degrees Fahrenheit. Allow the slices to cook for five to 10 minutes, depending on how brown and dry you want them to be.
Put on oven mitts and remove the tray from the halogen oven. Use a spatula to remove the slices from the oven bottom and tray so they don't stick to these surfaces as they dry. Place them on a clean dish. As the slices dry, they will become harder.