Place the potatoes into a pot of cold water, bring to a boil and cook until fork tender. You don't want to overcook them because they will start to fall apart when mixing everything.
Drain the potatoes and cool slightly.
In a bowl whisk together the dijon mustard, olive oil, red wine vinegar, garlic powder, salt and pepper.
In a large bowl toss together the potatoes, the bell peppers, scallions and dressing. Coat everything well. {NOTE: depending on how hot the potatoes are and the exact weight you may need to add a little extra drizzle of olive oil to keep things moist}
Garnish the potato salad with some fresh chopped parsley.
Recipe by LeMoine Family Kitchen at https://www.lemoinefamilykitchen.com/2015/07/potato-salad-with-dijon-vinegar-dressing/