Cook the beans: I use my electric pressure cooker to save time, but you can cook your beans in a pot on the stove, or in your crockpot if you have lots of time.
Sauté the onion, bell pepper, and garlic: In a large skillet, heat the olive oil over medium heat. Add the diced onion and bell pepper, sautéing until the onion becomes translucent and fragrant. Add the garlic and sauté for a minute or two.
Add the ground beef or turkey, breaking it apart with a spoon. Cook the meat until browned, about 8-10 minutes. Drain any excess fat.
Put it all together: Put the meat mixture into your slow cooker. Add the rest of the ingredients: the cooked beans, the diced tomatoes, tomato sauce, chili powder, salt, and pepper. Stir everything together. Add a bit of the liquid from cooking the beans if your chili seems too thick.
Let it cook: Cook the chili in your slow cooker on low all day, or on high for several hours. The longer it cooks, the better it gets!
Taste and season: Taste and adjust the seasoning if necessary. Serve topped with shredded cheese or your other favorite toppings. Enjoy!