Heat olive oil in a large pot over medium heat. Cook the diced onion and bell pepper for 5 minutes until softened.
Add the garlic, chili powder, cumin, and paprika. Stir 30 seconds until fragrant.
Add the diced tomatoes with their juices. Drain and rinse all three types of beans, then add to the pot along with the corn.
Bring to a boil, then reduce heat and simmer for 30 minutes, stirring occasionally.
Season with salt and pepper. For a thicker chili, mash some beans against the side of the pot.
Serve topped with avocado, sour cream, shredded cheese, or cilantro.
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