Main Dressing:

• 1 cup mayonnaise
• 1 cup sour cream
• 1 (1-ounce) packet ranch dressing mix, or scant 1/4 cup homemade
• 1/4 cup chopped fresh soft herbs, such as chives, parsley leaves, dill, or a combination, plus more for garnish if desired
• 1/2 teaspoon freshly ground black pepper

Salad:

• 6 ounces bacon (about 6 slices), cut crosswise into 1/4-inch pieces
• 2 medium tomatoes, diced (about 2 cups)
• 1/4 teaspoon kosher salt
• 12 ounces dry short pasta, such as fusilli
• 1 medium head broccoli (about 12 ounces), cut into small bite-sized florets (about 3 cups)
• 2 medium radishes, thinly sliced
• 2 medium scallions, finely chopped
• 1 (4-ounce) can sliced black olives, drained
• 3 medium carrots, peeled and grated on the large holes of a box grater (about 1 cup)
• 4 ounces sharp cheddar cheese, grated on the large holes of a box grater (about 1 1/2 cups)
• 1/4 cup sunflower seeds