Whoopie Pie Cake - cooking recipe

Ingredients

For the cake
1 cup margarine (if using margarine, not spread or tub product) or 1 cup butter (if using margarine, not spread or tub product)
2 cups sugar
2 1/4 cups flour
1 teaspoon baking soda
1 teaspoon salt
8 tablespoons cocoa
1 1/4 cups buttermilk (soured milk may be subbed, if necessary)
3 eggs
For the frosting
3 tablespoons flour
1 cup milk
1 cup sugar
1 teaspoon vanilla
1 cup butter (must be butter)

Preparation

Preheat oven to 350F; grease and dust two 9-inch cake pans with cocoa.
Beat butter and sugar together until fluffy; add eggs and beat until smooth.
Sift dry ingredients together; add alternatively with buttermilk to the egg batter and beat for two minutes.
Pour equally into prepared cake pans.
Bake for 25 minutes or until cakes test done.
Let rest in cake pans for 10 minutes, then turn out onto cooling rack to complete cooling.
While the cake is cooling, make the frosting: Add milk to flour slowly, avoiding lumps.
Cook flour and milk until very thick, stirring constantly.
Cool completely.
Cream sugar, butter and vanilla until fluffy.
Add to cooked mixture.
Beat, high speed, until very fluffy.
Looks and tastes like whipped cream.
Place one layer on cake plate and liberally frost top.
Place second layer on top of first and frost top and sides.
Sift cocoa powder lightly over the top for garnish, if desired.