Beef and Bean Taco Casserole

1 Lb. lean ground beef
1 can (16 oz) refried beans
1 jar thick and chunky salsa
1 pkg. taco seasoning
2 1/2 c. coarsely broken, Doritos Nacho Cheese chips
1/2 medium green bell pepper, chopped
4 medium green onions, sliced
2 medium tomatoes, chopped
1 cup shredded cheddar or Monterrey jack cheese, grated
1/4 cup sliced olives
1 cup shredded lettuce

Heat oven to 350*F. In skillet brown the beef, drain. Stir in refried beans, salsa and taco seasoning mix. Reduce heat to medium. Heat to boiling, stirring occasionally.
In ungreased 2-quart casserole , place 2 cups of broken chips on the bottom. Top evenly with beef mixture. Sprinkle with cheese, bell pepper, green onions, 1 cup of tomatoes, and olives.
Bake uncovered 20-30 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 chips.