1In large bowl, beat eggs with whisk. Add half-and-half, salt and pepper; beat well. In 12-inch nonstick skillet, melt butter over medium heat. Add egg mixture; cook about 7 minutes, scraping cooked eggs up from bottom of skillet occasionally, until mixture is firm but still moist. Stir in soup and chives.
2Spray 3- to 4-quart slow cooker with cooking spray. Spread 1/3 cup of the salsa in bottom of slow cooker. Carefully place half of the tortilla strips on salsa to within 1/2 inch of edge of slow cooker. Top with 1/2 cup of the beans, 3 cups of the egg mixture and 1/2 cup of the cheese. Layer with remaining salsa, tortilla strips, beans and egg mixture.
3Cover; cook on High heat setting 2 hours. Sprinkle with remaining 1/2 cup cheese. Cover; let stand until cheese is melted. Serve with sour cream and onions.