CRUMBLE meat into microwaveable plastic colander; place over microwaveable bowl. Microwave on HIGH 8 min., stirring and breaking up meat every 2 min. Discard fat. Transfer meat to 9-inch microwaveable pie plate. Stir in seasoning mix and water. Microwave 5 min., stirring after 3 min.
REMOVE half the meat mixture; set aside. Cover remaining meat mixture in pie plate with 8 tortilla quarters, overlapping as necessary to make even layer. Repeat layers of meat mixture and tortillas. Top with salsa and cheese. Microwave 4 min.
TOP with remaining ingredients. Cut into wedges to serve.