Preheat oven to 350 degrees F. Grease 13 x 9 baking dish. In a large skillet over medium-high heat, cook beef, stirring ocasionally, until browned. Stir in taco seasoning and 3/4 cup water; cook for 10 minutes; stir in salsa. Meanwhile, cook pierogies, following package directions; drain well. Spoon half of the beef mixture into the prepared dish; top with half of the pierogies and half of both cheeses; repeat layers. Sprinkle tortilla chips on top. Cover with aluminum foil. Bake 15 minutes; remove foil and bake until the mixture bubbles and the topping is light brown, 5 to 10 minutes longer.
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