Creating a fantastic Green Bean Potato Salad is simple if you follow these step-by-step instructions:

1. Boil the Potatoes: In a pot, place the diced potatoes and cover with water. Add a pinch of salt and bring to a boil. Cook for about 10-15 minutes until tender.

2. Blanch the Green Beans: While the potatoes are cooking, bring a separate pot of salted water to a boil. Add the green beans and cook for about 3-4 minutes, until bright green and tender-crisp. Drain and immediately rinse with cold water to stop cooking.

3. Prepare the Dressing: In a bowl, whisk together the olive oil, vinegar, Dijon mustard, salt, and pepper until emulsified.

4. Combine Ingredients: In a large bowl, combine the cooked potatoes, blanched green beans, red onion, cherry tomatoes, and parsley.

5. Add the Dressing: Pour the dressing over the salad and gently toss until all ingredients are coated.

6. Chill: Allow the salad to sit in the fridge for about 10 minutes before serving. This helps the flavors meld beautifully.

7. Serve: Give it a final toss before serving to ensure everything is well mixed.

Following these straightforward steps will lead you to create a delightful Green Bean Potato Salad that you and your guests will love.