For crust, unroll crescent rolls and pat into 15 1/2×2-inch baking pan. Bake according to package directions. Cool.
Meanwhile, in small mixing bowl stir together cream cheese, mayonnaise, dillweed and salad dressing mix. Spread evenly over cooled crust. Sprinkle with desired toppings then shredded Cheddar, Mozzarella or Monterey Jack cheese.
Topping options: Finely chopped broccoli, cauliflower or green pepper; seeded and chopped tomato; thinly sliced green onion, black olives, or celery; or shredded carrots.