Combine moong dal, chopped spinach, onion, green chilies and water in an Instant pot. Lock the lid and cook on 'High Pressure/ Manual' for 6-8 minutes*. Once the timer goes off, let the pressure reduce naturally.
1 cup Split moong dal, rinsed and drained, 3 cups Spinach, chopped, 1 Small Onion, chopped, 2-3 Green chilies, slit, 2 cups Water