Melt In Your Mouth Blueberry Cake

This is a nice tender cake - one of my Mom's specialties from years ago. It is a great cake to take along to a picnic.
 
Ingredients :

•     1/2 cup butter
•     1/2 cup white sugar
•     1/4 teaspoon salt
•     1 teaspoon vanilla extract
•     2 egg yolks
•     1 1/2 cups all-purpose flour
•     1 teaspoon baking powder
•     1/3 cup milk
•     2 egg whites
•     1/4 cup white sugar
•     1 1/2 cups fresh blueberries
•     1 tablespoon all-purpose flour
•     1 tablespoon white sugar

Directions

1. Preheat oven to 350 degrees F (175 degrees C). Grease and flour an 8 inch square pan.
2. Cream butter or margarine and 1/2 cup sugar until fluffy. Add salt and vanilla. Separate eggs and reserve the whites. Add egg yolks to the sugar mixture; beat until creamy.
3. Combine 1 1/2 cups flour and baking powder; add alternately with milk to egg yolk mixture. Coat berries with 1 tablespoon flour and add to batter.
4. In a separate bowl, beat whites until soft peaks form. Add 1/4 cup of sugar, 1 tablespoon at a time, and beat until stiff peaks form. Fold egg whites into batter. Pour into prepared pan. Sprinkle top with remaining 1 tablespoon sugar.
5. Bake for 50 minutes, or until cake tests done.

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