Cook and stir ground beef and onion until beef is brown; drain.
Stir in seasoning mix.
Spread beef mixture in pie plate.
Sprinkle with chiles and cheese.
Beat remaining ingredients until smooth, 15 seconds in blender on high speed or l minute with hand beater.
Pour into pie plate.
Bake until golden brown and knife inserted halfway between center and edge comes out cleans 25 to 30 minutes.
Let stand 5 minutes before cutting.
Refrigerate any remaining pie.
High Altitude Directions (3500 to 6500 feet): Bake about 30 minutes.
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