In a large skillet on medium-low heat, add oil and sauté onion and garlic until tender, about 4 minutes. Add diced bell pepper, zucchini, broccoli, and sun-dried tomatoes and continue sautéing for 2 minutes.
In a medium mixing bowl, whisk together eggs, egg whites, milk, spices, and ¼ cup parmesan cheese. Lightly spray a 9 inch pie dish, add sautéed vegetables. Pour egg mixture over vegetables, make sure to cover all veggies.
Loosely cover with foil and bake 10 minutes at 425 degrees, reduce heat to 350 and continue baking 20-25 minutes. Remove foil the last few minutes of baking time and sprinkle with the remaining parmesan cheese. Quiche is done when it puffs and a knife inserted in the center comes out clean.