Creating this delightful French-Style Potato and Green Bean Salad is easy when you follow these steps:

1. Prepare the Potatoes: Start by washing the small potatoes. If they are larger than bite-sized, cut them in half.
2. Boil Potatoes: In a large pot of boiling salted water, add the potatoes. Cook for about 10-12 minutes, or until fork-tender.
3. Check Potatoes: Remove the potatoes and drain them in a colander. Allow them to cool slightly before cutting them into cubes for easier mixing.
4. Prepare Green Beans: In the same boiling water, add the green beans. Blanch them for about 3-4 minutes until bright green and tender-crisp.
5. Cool Green Beans: Immediately plunge the green beans into an ice bath to stop the cooking process and retain their vibrant color. Drain and set aside.
6. Mix Dressing: In a small bowl, whisk together the olive oil, white wine vinegar, Dijon mustard, salt, and pepper.
7. Combine Ingredients: In a large mixing bowl, combine the cooled potatoes, green beans, and diced red onion.
8. Add Dressing: Pour the vinaigrette over the salad ingredients and toss gently to coat everything evenly.
9. Adjust Seasoning: Taste and adjust seasoning with more salt or pepper if needed.
10. Garnish: Sprinkle the chopped fresh parsley on top before serving.

By following these simple instructions, you’ll have a delicious and colorful salad ready to impress!