HEAT oven to 400ºF.
BROWN meat with onions in large skillet on medium-high heat; drain.
Stir in next 4 ingredients.
ARRANGE 3 flour or 6 corn tortillas in single layer on bottom of 13x9-inch baking dish. Cover with layers of half each meat mixture, sour cream and cheese. Repeat layers; cover.
BAKE 40 min. or until casserole is heated through and cheese is melted, uncovering after 30 min. Let stand 5 min
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