Stir together flour and salt. In a large mixer bowl, beat butter or margarine with electric mixer on medium speed for 30 seconds. Add brown sugar and vanilla; beat until fluffy. Add egg yolk; beat until well combined. Stir dry ingredients into sugar mixture, mixing well Pat batter evenly in a ungreased 15 x 10 x 1" baking pan. Brush top with beaten egg white. Combine sugar and cinnamon; sprinkle evenly over top. Sprinkle almonds over all. Bake in 350 degree oven for 15 to 18 minutes or until light brown. Cut into 1 1/2" diamonds while warm. Cool in pan. Remove from pan with spatula.