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Heat oil in a large pot over medium-high heat. Add onion and sauté for about 3 minutes. Add garlic and sauté 1 minute more. Add chili powder, cumin, oregano, and chili flakes and stir for about 30 seconds.
Add the peppers, carrots, and celery and cook for about 5 minutes, or until they just start to soften. Add tomatoes and their juice and bring to a simmer. Once the chili begins to simmer, reduce the heat to medium-low. You want the chili to be at a low simmer with the lid off.
Continue to cook the chili, stirring occasionally, for 20 minutes. Add beans and corn and let the chili return to a simmer. Cook for 5 more minutes or until the corn and beans have heated through.
Generously salt to taste.
Serve on its own or topped with one (or all!) of the delicious toppings. Enjoy!