1) Cut up veggies into the same size pieces (cut small -- 1/2" to 1" for faster roasting), preheat oven to hot (425-475 degrees). Throw in that washed & dried spinach, too. Toss the veggies in a light coating of Olive Oil, sprinkle with salt and freshly-ground pepper.
2) Arrange on a rimmed cookie sheet (keeping more towards the out-side of the pan for more browning and faster cooking). May line the sheet with parchment paper to keep from sticking.
3) Roast for about 15-20 minutes (shorter time for smaller pieces).
My kids love roasted veggies coated with melted cheese (bunch up the veg and top with cheese and pop under the broiler for a minute or two. Or, throw roasted veggies onto a hot skillet with about 2T butter, add about 4 beaten eggs, olives and feta cheese. Dinner!