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In a small bowl, whisk together the ingredients for the mayo. Add more or less chipotle depending on how spicy you like it.
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To make the beans, heat the olive oil in a large pan over medium heat. Add the garlic, chili powder, cumin and cook for 30 seconds. Add the black beans and broth. Let simmer for 5 minutes on low. Using a potato masher, smash up the beans. Turn off the heat and set aside.
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If you'd like to toast your rolls, spread a little butter on the buns and add to a toaster oven and toast until browned on the edges. To assemble, add the chipotle mayo, beans, lettuce, tomato, red onion, and avocado.
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Serve immediately.