Caesar Pasta Salad

Name: Caesar Pasta Salad
Ingredients: 1 cup mayonnaise; â…“ cup sour cream; 1 large clove garlic, pressed; 2 tablespoons lemon juice; 2 anchovies, finely minced; 1 teaspoon Worcestershire sauce; 1 pound penne pasta, cooked until al dente and rinsed with cool water; 6 large leaves Romaine lettuce, thinly sliced; 1½ cups grape tomatoes; 4 green onions. green parts sliced; ½ cup finely shredded Parmesan cheese; ½ teaspoon ground black pepper; 2 grilled chicken breasts, diced; 1½ cups croutons