Step 1

Cook the pasta according to the package directions. Drain and rinse under cold water to cool the pasta. Let stand 5 minutes.

Step 2

Whisk together the mayonnaise, sour cream, lemon juice, parsley, salt, garlic powder, and pepper in a large bowl. Add the pasta, tuna, peas, celery, bell pepper, and onion. Gently fold together until well coated, making sure not to break up the tuna too much.

Step 3

Cover and refrigerate for 30 minutes. Spoon into a serving bowl lined with lettuce leaves. Top with chips just before serving.