Preheat oven to 325 degrees F.
Pour butter in 9x13 inch baking dish; tilt dish to coat bottom. In large bowl, whisk eggs, sour cream milk and salt until well blended. Stir in onions; pour into prepared dish.
Bake 35-40 minutes or until eggs are set but still moist. Cut into squares to serve.
By Robin from Washington, IA
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