black bean and roasted sweet potato soup

Ingredients

• 2 medium sweet potatoes, peeled and cubed
• 1-2 tablespoon oil
• 3 cans black beans, drained and rinsed
• 3 quarts stock(beef, chicken or vegetable)
• 2 cups chopped red(or green) pepper
• 1 cup chopped onion
• 1 cup chopped celery
• 1 cup crushed tomatoes(or diced tomatoes or tomato sauce)
• 1 can diced green chilis(or if you prefer more heat, sub some jalepeno)
• 1 tablespoon dried parsley
• 1 1/2 teaspoons chili powder
• 1 teaspoon cumin
• 1 teaspoon salt
• 1/4 teaspoon garlic powder
• 1/8 teaspoon coarsely ground black pepper