One Pot Vegetarian Stew

Ingredients

• 2 teaspoons vegetable oil
• 1 medium onion, chopped
• 1 medium green bell pepper, chopped
• 3 cloves garlic, finely chopped
• 1 (14½-ounce) can diced tomatoes
• 2 cups fresh or frozen corn
• 1 (14½-ounce) can low-sodium vegetable broth
• 2 teaspoons chili powder
• 2 teaspoons dried oregano
• 1 (15-ounce) can black beans, drained and rinsed
• 1 (15-ounce) can red beans, drained and rinsed
• 8 tablespoons fat free sour cream (optional)