Turn on the slow cooker to LOW and preheat while preparing the ingredients.
Add the kidney beans, diced tomatoes with their juice, tomato sauce, chili powder, garlic chili sauce, and minced garlic to a 2-quart slow cooker.
Heat the olive oil in a medium skillet over medium heat. Sauté the onion and green bell pepper for 2–3 minutes, then transfer them to the slow cooker.
In the same skillet, brown the ground beef. Season with the salt and garlic powder, drain off excess grease, and add the beef to the slow cooker. Stir gently to combine.
Cover and cook on low for 5–6 hours.
Notes
This chili has noticeable heat. If you prefer it milder, reduce the chili powder and garlic chili sauce.
For extra heat, add a pinch of cayenne or a few red pepper flakes.
Ground turkey can be substituted for the beef with great results.
Spicy chili beans or black beans can be used in place of kidney beans for variety.