Red Potato Salad

Ingredients 1 cup yogurt, plain fat-free 1/4 cup mayonnaise, low-fat 1 tablespoon yellow mustard 4 medium red potatoes (about 1 pound) 1/2 cup celery, chopped 1/4 cup onion, finely chopped 1/2 teaspoon salt 1/4 teaspoon pepper Directions To prepare sauce,…