Creamy Vegan Macaroni Salad

Name: Creamy Vegan Macaroni Salad
Ingredients: Kosher salt and freshly ground black pepper; 8 ounces vegan elbow macaroni (about 2 cups; see Cook's Note); 1/2 cup vegan mayonnaise; 1/4 cup vegan sour cream; 2 tablespoons apple cider vinegar; 2 tablespoons fresh flat-leaf parsley leaves, finely chopped; 1 teaspoon dry mustard powder; 1/2 teaspoon onion powder; 2 celery stalks, finely diced (about 3/4 cup); 1/2 large red bell pepper, finely diced (about 3/4 cup)