Heat a large heavy-bottomed pot or Dutch oven over medium-high heat. Add the ground beef and cook, breaking it apart with a spoon, until fully browned and no longer pink. Drain excess grease if needed.
Add the chopped bell pepper, onion, celery, and jalapeño to the pot. Cook for 3–5 minutes, stirring often, until the vegetables begin to soften.
Stir in the tomato sauce, diced tomatoes, pinto beans, kidney beans, chili powder, cumin, oregano, and minced garlic. Season with salt and pepper to taste.
Bring the chili to a gentle boil, then reduce the heat to low. Cover and let simmer for at least 2 hours, stirring occasionally, until thickened and flavors are fully developed.
Taste and adjust seasoning as needed before serving.
Enjoy!