I know 1/4 cup of oil sounds like a lot for a modern recipe. But nothing chaps my nose like seeing "1 TBSP" of oil in a recipe and then finding out that there is NO WAY that is going to get the job done. I have been unable to brown this much chicken in less oil. If you are concerned about that, just skip that step. It gives the outside an extra delicious brownness, but the finished dish will still be good regardless. If you need to make this ahead, just freeze the browned chicken in a ziplock bag. You can thaw completely and cook 4-6 hours on low, or do it frozen for 6-8 hours.