1/2 c. mayonnaise
1 c. sugar
1/4 tsp. salt
1 tsp. vanilla
2 eggs, separated
1 1/2 c. plus 1 tbsp. flour
1 tsp. baking powder
1/3 c. milk
1 1/2 c. fresh blueberries

Cream butter with 3/4 cup of the sugar. Add salt and vanilla. Add egg yolks and beat until creamy. Sift 1 1/2 cups flour with the baking powder. Add alternately with the milk to egg yolk mixture. Beat egg whites until stiff, and add remaining sugar. Coat berries with 1 tablespoon flour and add to batter. Fold in egg whites. Pour into a battered 8 inch square pan. Sprinkle with granulated sugar. Bake at 350 degrees for 50 minutes. Serves 6 to 8.