Sweet Onion Casserole
["3 large sweet onions", "3 Tbsp. butter", "3 jumbo eggs", "1 1/2 c. milk", "4 Tbsp. flour", "1/2 tsp. salt", "1/2 tsp. pepper"]
["Butter 9-inch pie plate.", "Peel and slice onion into 1/4-inch rounds.", "Saute in butter in saucepan until soft, not brown.", "Whisk other ingredients until well mixed."]
["sweet onions", "butter", "eggs", "milk", "flour", "salt", "pepper"]