Preheat oven to 325 degrees. Grease and flour 9x13 baking pan, or 8x12.
Cream melted butter and sugar; add eggs, vanilla and mix well. Mix dry ingredients together and fold into creamed mixture, mixing thoroughly. Pour into prepared pan.
Must use butter for flavor; I use salted butter.
Pour into pan and cook 30 minutes (ovens may vary - check at 25 minutes). Cook a few minutes longer for 8x13 pan.
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