1. Combine the beans, ground beef or turkey, onion, and chili powder in a shallow 2 quart microwave-proof dish. Cover with wax paper and microwave on high (100 percent power) about 8 minutes or until meat is cooked through, stirring to mash beans and break up meat every 3 minutes. Drain off fat, if needed.
2. Stir in the salsa and sprinkle with cheese. Microwave on high (100 percent power) for 1 to 2 minutes or until cheese is melted. Meanwhile, combine the sour cream, cilantro, salt, and pepper.
3. Spread sour cream mixture on top of hot bean-meat mixture. Sprinkle with the avocado, tomatoes, and green onions. Serve warm with tortilla chips. Makes 112 servings (7 cups).