Preheat oven to 400. Spray a 13x9 pan with cooking spray. Cook beef in skillet until it's brown and cooked through. Drain. Stir in taco seasoning and onion, spread in pan. Sprinkle with tomatoes and corn.

Stir remaining ingredients in medium bowl with whisk until blended, pour into pan.

Bake about 30 minutes or until knife comes out clean.

Let stand 5 minutes before serving.

-- JMagGuthrie - 31 May 2009