Use Duncan Hines yellow BUTTER recipe cake mix. Follow directions and bake in rectangular pan.
Your icing;
12 oz of evaporated milk
2 sticks of melted butter
1 1/2 cups of sugar
1 cup of toasted pecans chopped
1 teaspoon of vanilla
1/4 teaspoon of salt
Combine milk, sugar and bring to very slow boil for 10 minutes. Add butter and rest of ingredients cook for additional 3 minutes. Pour over warm, baked cake. Should do it.