1) Preheat oven to 400°F. Brown lean beef until no longer pink; while beef is browning take a 9x13 baking dish and coat with a cooking spray to prevent sticking. Take pizza crust and press into the bottom and up sides of dish. Sprinkle 1 cup of crushed chips on top of pizza crust.
2) When beef is browned drain and return to the skillet, add tomato soup, tomato sauce and the taco seasoning. Mix well and warm in skillet for a couple of minutes. Spread meat mixture over the top of the chips in the baking dish. Spread sour cream over the top of the meat mixture. Spread the shredded cheese evenly over the sour cream. Top with remaining crushed taco chips.
3) Bake for 20 minutes. (This depends on recommended temp. and time for pizza crust).