This is the perfect side dish for grilled steak or chicken. A lighter version of traditional potato salad with the added benefit of sneaking in some veggies.
Place potatoes in a large pot. Add enough water to cover potatoes by at least one inch. Bring to a boil. Cook potatoes until fork tender, about 10-15 minutes. Add green beans last 5 minutes of cooking. Drain and rinse under cold water.
Make the Dressing:
Ina small bowl, whisk together mayonnaise, sour cream, mustard, lemon juice, salt, and pepper. Stir in parsley.
Finish the Dish:
In a large bowl, gently toss the potatoes, beans, celery, and red onion with the dressing mix.