2 pounds new potatoes, cubed
1/2 c mayonnaise
1/2 c yogurt
1 T dijon mustard
1/2 t garlic powder
1/4 t salt
1/4 t pepper
1 small onion, chopped
3 T fresh dill (or 1/2-1/3 that amount of dried herb)
Cook potatoes until tender, but still firm. Stir together remaining ingredients in a large bowl. Add potatoes and stir to coat. Cover and chill at least 2 hours before serving.