Tidally locked planet
Sure if you have a tidally locked planet, half the planet is too hot for multicellular life and super dry, half is too cold and likely covered in an ice sheet and there is a narrow band of green along the twighlight area. so you have hot desert on on side cold desrtdesert on the other.
Large part of the planet can still have unicellular life, so you have an oxygen source, you can even have small seas rsting up much of the habitable zone by changing elevation.