Heat oven to 350°F. Cook turkey over medium-high heat until browned, 5 to 7 minutes Drain. Stir in pinto beans beans, salsa and taco seasoning mix. Reduce heat to medium. Heat to boiling, stirring occasionally.
In ungreased 2-quart casserole, place 2 cups of the broken tortilla chips. Top evenly with beef mixture. Sprinkle with bell pepper, onions, and the cheese.
Bake uncovered 20 to 25 minutes. Top baked casserole with lettuce, tomato and remaining 1/2 cup tortilla chips.