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vadalia or sweet onions, sliced
Using very low heat, saute onions in butter in a large covered skillet for 30 minutes. Onions should brown a bit and carmelize. Cool onions.
In a mixing bowl beat together milk and eggs, stir in cooled onions, salt, and pepper. Pour mixture into a buttered casserole dish and bake at 325 degrees until golden brown, about 40-45 minutes.