First, brown your lean ground beef in a large skillet over medium heat until it's fully cooked through. Make sure to drain any excess fat for a healthier dish.
Next, transfer the browned beef to your slow cooker. Add in the chopped onion, diced bell peppers, minced garlic, both cans of diced tomatoes (undrained), and the beef stock.
Now, sprinkle in the chili powder, cayenne pepper (add more if you love heat!), Italian seasoning, freshly ground black pepper, and sea salt. Give everything a good stir to ensure all the flavors are wonderfully combined.
Cover your slow cooker and let it work its magic! Cook on the LOW setting for 6-7 hours, or if you're short on time, cook on HIGH for 3-4 hours.
Once cooked, give it one last stir and serve up this hearty, delicious chili!