Chocolate and Banana Cream Cake

---- Cake:

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1/2 cup all-purpose flour
3/4 cup sugar
1/4 cup cocoa powder
1 teaspoon baking powder
1/4 teaspoon salt
3 large eggs
2 tablespoons water
1 teaspoon vanilla extract
2 bananas
---- Cream filling:

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3/4 cup sugar
1/3 cup cornstarch
1/2 teaspoon salt
2 cups milk
2 large eggs
2 tablespoons margarine -- solid
1 teaspoon vanilla extract
powdered sugar -- optional
whipped cream -- optional

Grease bottom of 13 x 9 x 2-inch pan. Line with waxed paper then grease again.
Preheat oven to 375 degrees.
1. Combine in small mixing bowl the flour, 1/2 cup sugar, cocoa, baking
powder and salt. Set aside.
2. In large mixing bowl, beat egg whites at high speed until soft mounds form.
Gradually add 1/4 cup sugar and continue beating until stiff peaks form.
3. Combine egg yolks, water and vanilla. Add to dry ingredients and beat one
minute at medium speed. Fold into the egg whites using rubber spatula.