Combine the first 5 ingredients in a small saucepan. Bring mixture to a boil. Reduce heat to medium-low; gently boil 10 minutes or until sauce thickens. Stir in butter.
Spoon 1/2 cup yogurt into each of 4 bowls; top each serving with about 1/4 cup sauce.
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Very tasty. I used Whey Low diabetic sugar substitute and needed a little more than the quarter cup to make it sweet enough. Also added a half teaspoon of cornstarch to thicken it a little. Will use again!