(12 oz.) Heat oil in a large saucepan. Saute onion, cleery, and garlic until transparent, about 5 minutes. Stir in tomato sauce, vinegar, cocoa, chili powder, and basil. Simmer 15 minutes, stirring occasionally. Add beans and corn. Simmer 15 minutes longer. Stir in 2 cups of the cheese. Sprinkle remaining cheese on top of chili before serving.