In medium bowl, combine crushed tortilla chips, ½ cup cheese and butter; press into bottom of a 9-inch pie plate. Bake in a preheated 375°F oven 10 minutes.
Meanwhile, in medium skillet over medium heat, cook and crumble beef until no longer pink; drain. Stir in taco seasoning mix and 1/3 cup water; cook according to package directions.
Place refried beans and ½ cup cheese in a microwave-safe bowl; microwave (HIGH) 2 minutes, stirring occasionally. Spread over pie. Top with beef and remaining cheese. Return to oven; continue baking 10 minutes.
Top with lettuce, tomatoes and black olives. Serve with sour cream and salsa, if desired.
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