Wrap chicken and freeze until firm, but not solid. Grind coarsely in processor, using onoff turns.
Heat oil in large dutch oven over medium-high heat. Add onions, green peppers and garlic and cook until golden brown, stirring frequently, about 15 min.
Mix in cumin, oregano, coriander and thyme and stir 2 min.
Add chicken, ground round and bay leaves. Cook until meat and chicken are no longer pink, breaking up with a spoon, about 5 min.
Add chili powder. Reduce heat to medium and cook 5 min, stirring frequently.
Add tomatoes, breaking up large pieces with a spoon. Mix in tomato paste, salt and pepper. Reduce heat, cover and simmer 45 min., stirring occasionally.
Uncover, reduce heat to lowest setting and cook 1 1/2 hours, stirring frequently near end and adding water if necessary, to prevent burning. Adjust seasoning. (Can be prepared 1 day ahead and refrigerated.)
Sprinkle avocado with lemon juice.
Ladle chili into large soup bowls. Spoon 2 tablespoons yogurt in center of each. Top with diced avocado and minced cilantro. Serve hot.
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