Heat oil in a medium to large dutch oven or pot. Add chopped garlic, onion and saute them for a couple of mins.
Then add chopped tomatoes, sweet potato, diced red pepper, whole lentils, chipotle chili, and spices like oregano, smoked paprika, and cumin powder. Mix everything well and saute the mixture for 2-3 mins.
Add the black beans, all the liquid, mix well and bring the mixture to a boil.
Season well with salt, cover, and cook the mixture on low heat for 15-18 min or until the lentils are nice and tender.
Garnish the bowl of chili with some fresh cilantro, lime wedges, crushed tortilla chips and serve warm.