Preheat the oven to 375°F.
Unroll the crescent dough onto the sheet pan and once the oven is preheated, bake accordiing to instructions on the package (about 10 minutes). Allow to cool for at least 30 minutes.
While the dough is baking, mix together the ingredients for the cream cheese mixture (cream cheeese, sour cream, shredded cheese, green onions, ranch dressing and garlic powder) until it is smooth.
Let the mixture chill in the fridge until the dough has cooled off.
Chop the vegetables and add them to a large bowl and mix well.
Once the crescent has cooled off, remove the cream cheese mixture from the fridge and add it on top, making sure to form a nice even layer across the crust.
Top with chopped vegetables until the pizza is covered.
Cut into squares to serve.