Mix first 3 ingredients until smooth. Batter will be thick. Put 1/2 batter in 9 by 13 sprayed pan. Then sprinkle 1/2 of crumbly mix over, Put remaining batter over crumbly mix, then rest of crumbly mix.
Bake 350 degrees for 30-35 min.
Let cake cool slightly, then dribble thin powdered sugar icing over cake.
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