Heat oven to 350 degrees F. Lightly grease and flour a cookie sheet.
In a large bowl sift together flour, salt, baking powder and baking soda; set
In a large mixing bowl combine and cream together shortening and sugar. Add and
beat thoroughly eggs, bananas, sour milk and vanilla extract. Add dry ingredients
gradually, beating after each addition.
Drop by heaping teaspoonsful onto prepared cookie sheet 2 1/2 inches apart. Bake
for 8 to 15 minutes, depending on size of cookie, until they spring back to touch.
Remove to wire rack to cool.
Filling: Beat egg whites until stiff. Add shortening and vanilla extract; blend.
Add milk and then add the sugar. Beat until smooth. Spread filling on the bottom
side of one cookie; top with a second cookie bottom side down.