1. Place crescent dough on cookie sheet - piece edges together where needed. Bake according to package directions. Let cool.
2. In a bowl mix mayo, ranch dressing, and cream cheese. Spread mixture on dough (when dough is cool).
3. Cut florets from broccoli and cauliflower; chop red pepper and place on cheese spread. Use spatula to press veggies to the cheese spread.
4. Sprinkle on cheddar cheese. Chill overnight. Serve cold.