So when we want to get that extra-thick texture, sometimes we resort to the old technique of draining plain low-fat yogurt overnight. This method slowly drains away the extra water, giving us a richer, thicker yogurt.
To drain yogurt, line a large bowl with several thicknesses of cheesecloth. Dump the canister of yogurt into the cheesecloth, then gather the ends and fasten them tightly with a rubber band. Slip the rubber band over a cupboard knob and hang the bundle over the bowl. There will be a thin stream of water that comes out immediately, which will slow to a drip.
Leave hanging all afternoon, or transfer to the fridge and drain all night.