In large skillet over medium high heat, brown 1 1/2 pounds ground beef with 1 medium white onion and 1 green bell pepper(chopped) until meat is slightly browned and crumbly, about 10 minutes. Add 2 cloves garlic(minced), stir, and cook for a couple more minutes. Add mixture to large slow cooker.
Stir in remaining ingredients. Set slow cooker to low and cook for 4-8 hours.
Alternatively, ground beef can be browned in electric pressure cooker and the remaining ingredients can be added, and chili can be cooked on high pressure for 20 minutes. Same process for cooktop, but it would need to simmer for a good hour (minimum).
Prior to serving, use a masher to partially mash the chili, smashing some of the beans and the tomatoes. Garnish with freshly grated sharp cheddar, sour cream, and sliced green onions. Season with freshly ground pepper.