#1 To make the dressing: in a medium bowl, whisk sour cream, milk, and ranch mix until slightly thickened #2 Refrigerate for 30 minutes or until ready to use #3 To make the salad: in a large glass bowl or trifle dish, layer half the lettuce, then half the tomatoes, corn, onion, peas, cheese, and egg. Top with half the dressing. Repeat layers one more time except for ranch dressing #4 Cover and refrigerate until ready to serve. Serve the stacked salad with remaining ranch dressing.