Place ground meat in large skillet over medium heat and break up with a spoon. Once meat begins to brown, add onions and cook until no longer pink. Drain the mixture and transfer to slow cooker. Stir in remaining ingredients and cook on low for 2 to 3 hours, stirring occasionally. Garnish with cheese and fresh chopped tomato.
Best served with pretzels and thick-cut potato chips. Also a perfect topper for potato skins!
Makes about 4 cups.