Use 11X 15 baking sheet.
Unroll crescent rolls onto sheet, pat seams together (usually have one left over).
Bake 375 for 12 min.n watch so it doesn't burn. (Cool completely)
Combine sour cream, mayo, ranch drsg, onion.
Spread onto cool crust.
Place on cut veges.
Sprinkle shredded cheese on top.
Wrap good with foil or saran wrap.