Unroll crescent roll dough on a small baking sheet. Arrange into a single layer to serve as a crust. Bake in the preheated oven for 10 minutes, or until puffed and lightly browned.

In a medium bowl, mix cream cheese, mayonnaise, dill, onion and garlic.

Spread the cream cheese mixture over the crescent roll dough. Layer with cauliflower, broccoli and green peppers. Top with Cheddar cheese. Chill until serving.