Preheat oven to 425F. Lightly oil or spray Baker's Half Sheet pan. Place sweet potatoes in microwave safe bowl and precook for 3-5 minutes. Alternately you can pre-parbake them or steam them for 8-10 minutes. When they are cool enough to handle, mix the cubed sweet potatoes with the zucchini, red bell pepper, onion, black beans, corn, olive oil, garlic, chili powder, cumin, and paprika.