Beef and Bean Taco Casserole

1 pound lean ground beef 1 16 ounce can refried beans 1 16 ounce jar salsa 1 1 ounce package taco seasoning mix 2 1/2 cups coarsely broken tortilla chips 1/2 medium green bell pepper, chopped (3/4 cup) 4 medium green onions, sliced (1/4 cup) 2 medium tomatoes, chopped (1 1/2 cups) 1 cup shredded cheddar or Monterey Jack cheese (4 ounces) 1/4 cup sliced ripe olives 1 cup shredded lettuce 1. Heat oven to 350 degrees Fahrenheit. In 12-inch skillet, cook beef over medium-high heat 5 to 7 minutes, stirring occasionally, until thoroughly cooked; drain. Stir in refried beans, salsa, and taco seasoning mix. Reduce heat to medium. Heat to boiling, stirring occasionally. 2. In ungreased 2-quart casserole, place 2 cups of the broken tortilla chips. Top evenly with beef mixture. Sprinkle with bell pepper, onions, 1 cup of the tomato, the cheese, and olives. 3. Bake uncovered 20 to 30 minutes or until hot and bubbly and cheese is melted. Top baked casserole with lettuce, remaining 1/2 cup tomato, and remaining 1/2 cup tortilla chips. Serve with Sour Cream.