Cook macaroni according to package directions; drain and rinse with cold water. Drizzle with oil and toss to coat.
Place the lettuce in a 2½ quart glass serving bowl; top with macaroni and eggs. Sprinkle with salt and pepper. Layer with ham, salami and peas. Combine mayonnaise, sour cream, green onions and mustard. Spread over the top. Cover and refrigerate for several hours or overnight.
Just before serving sprinkle with cheese and parsley.