Preheat oven to 400 degrees. In a large skillet over medium heat, heat 1 Tb. oil; add onions, garlic, curry and cumin. Saute until onions are soft, about 5 minutes. Remove to a bowl.
Heat remaining oil in skillet; add peppers, eggplant, tomatoes and 1/2 cup water. Saute until soft, about 20 minutes. Stir in onions. Place in a shallow 8-by-8- inch baking dish.
In a saucepan, boil potatoes until done. Drain and smash. Stir in half and half, peas, salt and pepper. Spread over vegetables and top with Parmesan.