Combine all the ingredients in a blender: homemade yogurt, chilled water, ginger, green chili (optional), herbs, and spices.
Blend until it becomes smooth and frothy.
Pour into the serving glasses, garnish with fresh mint or coriander leaves and sprinkle some roasted cumin.Serve immediately or chill masala chaas for few hours before serving.
Notes
FreshHomemade Yogurt: Use fresh homemade whole milk curd for the best results. However, you can definitely use store-bought yogurt to make this chaas. Make sure it's fresh and not sour or stale.
Vegan: To make this chaas vegan, use plant-based yogurt, like almond or coconut milk yogurt.
Spicy: Adjust the green chili according to your taste. Skip if making for kids.
Immersion Blender: If you don't have a regular blender, you can also use an immersion blender to make the chaas.
Consistency: You can adjust the consistency of the chaas according to your preference. It should not be thick. For a thinner consistency, add more water.