Preheat a 4-quart pot over medium heat. Saute onions and pepper in oil with a pinch of salt, for 5 to 7 minutes. Add garlic and saute a minute more.
Add chili powder, sweet potatoes, lentils, salt and vegetable broth. Cover and bring to a boil. Let it boil for 15 to 20 minutes, stirring occasionally to prevent burning. When lentils are cooked and sweet potatoes are tender, add the remaining ingredients and heat through
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