Cook onion in butter until lightly browned.
Spoon into pie shell. Blend flour with ¼ cup sour cream till smooth, then combine with milk and other 1 ¼ cup sour cream.
Add salt to eggs and mix with sour cream, milk, and flour. Pour over onions in pie shell.
Bake in 325 oven for 30 minutes, or until center is firm.
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