Preheat oven to 350 degrees F (175 degrees C). Grease and flour one 9×13 inch baking pan.
Prepare cake mix according to package directions. Pour batter into prepared pan.
In a medium saucepan, combine evaporated milk, coconut, pecans, butter or margarine, sugar, egg yolks, and vanilla. Cook over low heat, stirring constantly, until mixture thickens. Remove from heat and spread over cake.
Bake in preheated oven for 30 to 35 minutes, or until a toothpick inserted into the center of the cake comes out clean. Allow to cool before serving.
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