- Heat butter in a pan, add cumin seeds and saute it. Now, add curry leaves and let it splutter. Then add chopped ginger, green chillies, onions, in the same pan and mix well. Add split green gram along with 1 cup of water in it and let it cook for about 3 minutes with closed lid. Once vegetables are cooked, add oats and mix it well. Delicious Oats upma is ready to serve.