Heat the olive oil in a large skillet over medium-high heat.
Add the ground beef, diced onions, and diced bell peppers to the skillet.
Cook until the beef is thoroughly browned and the vegetables have softened, breaking the meat into small crumbles as it cooks.
Transfer the beef and vegetable mixture into a slow cooker.
Add the kidney beans, crushed tomatoes, water, chili powder, cumin, garlic powder, sea salt, and black pepper.
Stir all ingredients until well combined.
Cover and cook on low for 6 to 8 hours, or on high for 3 to 4 hours, to allow the flavors to develop and the meat to become tender.
Ladle the chili into a bowl and serve hot.