There are lot's of recipes on the internet for Kale Chips. I experimented with oven temperature and several types of oil—all with good results. Low and slow seems to yield the greenest, tastiest chips. When I can plan it advance, I think cooking these for 45-60 minutes at 275F really is my favorite. But, I’m not always that patient. Especially because one sheet pan of kale chips lasts about 7 minutes in my house. My recipe reflects a happy medium: low enough to stay green but still be fast to make.