Now, pour batter immediately into each greased plate and fill it up to 1/2-inch thickness. Place plates in steamer and steam for 20-25 minutes over medium flame. After 20-25 minutes, insert a knife or toothpick into dhokla and check if it comes out clean. If it does, then it is ready otherwise cook 2-3 minutes more. Takeout plates from steamer and let them cool for a few minutes. Cut fluffy khaman dhokla into small squares using the knife.