Spread Pillsbury crescent rolls onto a cookie sheet (usually takes 2 cans for full sheet). Bake per directions until brown. Let cool.
While that is cooking, mix HIDDEN VALLEY® Ranch Dip (not dressing) with sour cream, per directions on packet. 1 packet per pizza is enough. Put in refrigerator and let thicken.
After dough has cooled, spread dip mix over dough. Cover with chopped vegetables of your choice. Carrots, tomatoes, cauliflower, mushrooms and broccoli are good. Top with shredded Cheddar cheese. It is best when refrigerated overnight.