Line a fine-mesh strainer or colander with a clean cheesecloth or muslin cloth. Place the strainer over a large bowl to catch the whey.
Pour the plain yogurt into the cheesecloth-lined strainer. If desired, mix the yogurt with salt before straining.
Gather the edges of the cheesecloth and tie them together to form a bundle. Hang the bundle over the bowl or place a weight on top of the yogurt to help press out the whey.
Let the yogurt drain for at least 4-6 hours or overnight in the refrigerator. The longer it drains, the thicker the chakka will become.
Once the yogurt has drained to your desired consistency, transfer the thickened yogurt cheese to a bowl.
If desired, mix in chopped fresh herbs for added flavor.
Enjoy your meal!