Here is the recipe (also from 101 Cookbooks)
Frozen Yogurt (Similar to Pinkberry's in NYC)
3 cups Greek-style yogurt (you must use Greek-style or it won't work)
3/4 cup sugar
1 teaspoon vanilla extract
Mix together the yogurt, sugar, and vanilla (if using). Stir until the sugar is completely dissolved. Refrigerate 1 hour.
Blend in ice cream maker until thick, which is about 15-20 minutes. Also, don't forget to freeze your ice cream maker before you do this (like me, DUH!)
*Put any additional add-ins you want like raspberries, blueberries, cut up candy pieces, peaches... I decided to leave mine plain and make yummo sundaes.
**This only makes about 3 servings. Double if you have more people (or big eaters).