Heat the olive oil in a large pot over medium heat. Add the onion and garlic and cook until the onion softens.
Stir in the minced chipotle pepper and cook for one minute to release its flavor.
Add the rinsed lentils, diced tomatoes, and vegetable broth. Bring the mixture to a boil, then reduce to a simmer.
Cover the pot and cook for 25 minutes, stirring occasionally, until the lentils are tender.
Add the chopped collard greens and stir until they wilt into the stew, about 5 minutes.
Season with salt and black pepper. Serve hot with cilantro and lime wedges on the side.