Banana Squares - cooking recipe

Ingredients

2 eggs, separated
2/3 c. shortening
1 1/2 c. sugar
1 c. mashed, ripe bananas (2 to 3 medium)
1 1/2 c. all-purpose flour
1 tsp. baking soda
1/4 c. sour milk *
1/2 tsp. vanilla extract
1/2 c. chopped walnuts (optional)
whipped cream and sliced bananas (optional)

Preparation

*To sour milk, place 1 teaspoon of white vinegar in a measuring cup; add enough milk to equal 1/4 cup.