Preheat oven to 350 degrees F (or grill to medium). Lightly coat all vegetables in olive oil, toss together, add garlic and oregano, toss again, and arrange in a lightly oiled shallow baking pan (for oven) or in a foil packet (for grill). Cook for 45 to 60 minutes, flipping occasionally. When vegetables are soft, transfer to a serving dish. Add olives, feta, basil, and cooked pasta. Season with salt and pepper and toss well. Garnish with fresh basil leaves, if available. Serves 6.