In a large heavy pot, heat oil over medium heat. Add onion, garlic and peppers and cook until tender about 5-8 minutes. Stir in spices and toss to coat vegetables. Pour in stock and beans and bring to a boil. Reduce heat to a simmer and cook for 15 minutes. In a blender, puree half of the soup until smooth and stir back into soup pot. Serve hot with garnishes.