Not quite sure about the prep time, but is well worth it.
well beaten
heaping
melted
Combine margarine, baking cocoa,water, eggs, and buttermilk in sauce pan mix well.
Bring to a boil, stirring often, remove from heat.
Add sugar, flour, vanilla, baking soda and salt, beat well.
Pour into greased and floured 9 by 13 cake pan.
Bake at 350 for 30 ninutes, cool.
Spread with melted peanut butter.
Chill until firm.
Combine margarine and baking cocoa in sauce pan, bring to a boil.
Add confectioners sugar, buttermilk, vanilla and peanut butter.
Beat until smooth,Pour over cake.
Chill until ready to serve.
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