Dressing: 1/2 cup mayonnaise 1/4 cup sour cream 1/4 cup fresh lemon juice (from 2 lemons) 2 tsp. kosher salt 1 1/2 tsp. garlic powder 1 tsp. onion powder 1/2 tsp. freshly ground black pepper Slaw Mix: 2 12-oz. pkg. broccoli slaw (about 8 packed cups) 3 scallions, thinly sliced (1/2 cup) 1/2 cup chopped fresh flat-leaf parsley, plus more for topping 1/3 cup roasted salted sunflower seeds, plus more for topping Instructions: Whisk mayonnaise, sour cream, lemon juice, salt, garlic powder, onion powder, and pepper in a large bowl until combined. Add broccoli slaw, scallions, parsley, and sunflower seeds; toss to combine. Top with more parsley, sunflower seeds, and pepper.