If you want it to be even thicker, strain the yogurt with some coffee filters or cheesecloth (about four layers) to get super thick Greek style yogurt.
This is the closest thing to Greek yogurt I've ever made!!! This is a super hit in our household. The texture is so thick and smooth. And you are so right about the thicker yogurt being achieved by adding more powdered milk. I absolutely live this recipe!!! Putting it in a wide mouth thermos is such a grand idea!! It's much better than using a yogurt maker. No electricity needed :) I can't thank you enough for sharing this one. You ROCK!!!!!
Welp wenchy woman. . .it WORKED!!!! My yogurt turned out thick and wonderful!!! I can't believe it. I have tried countless yogurt recipes and sometimes they are OK and sometimes they are runny. But this one is actually THICK! I used the sauce pan method instead of the crockpot (to cut down on time). My thermos only holds 4 cups, so I used the following measurements: 3 cups whole milk, 6 T powdered milk, 3 T whole milk plain yogurt. Let it sit for about 5 hours in the thermos, then dumped it into a container to put in the fridge and let it sit overnight (another 10 hours or so). WAY TO GO on this fun and easy method.