Toss the vegetables with the olive oil, salt and pepper in a large bowl. Arrange in a single layer on a large rimmed baking sheet. Bake for 35 to 45 minutes or until lightly roasted and tender.
Meanwhile, combine cottage cheese, sour cream, chives, dill, lemon peel, and garlic in a small bowl.
Serve the vegetables warm or at room temperature, with the dipping sauce.