In a large saucepan over medium-high heat, add olive oil. Add onion and sauté for 2-3 minutes, until it becomes translucent. Add garlic and continue to cook for another 2 minutes.
Add black beans, tomatoes, pumpkin, cinnamon, mexicorn, chipotle pepper, 2 tablespoons reserved Adobo sauce. Stir together until well combined. Add the vegetable broth.
Bring chili to a boil, then reduce to a simmer and cover. Let simmer for 60-90 minutes, stirring occasionally. Add apple cider vinegar. Season with salt to tastes. Serve hot.
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