They say "This veggie and potato casserole is a delicious way to enjoy a vegetarian meal or have a flavorful side dish with your main course.
Try mixing and matching your favorite vegetables for a variation." When I made it I used a combination of broccoli and cauliflower.
I did add the salt, pepper, and spices; the original calls only for garlic.
I might switch up the cheese next time as well, as I think mozzarella or monterrey jack (think something gooier) would be even better.