Cream butter or margarine and 1/4 cup brown .sugar together.
Sift flour, baking powder and salt, and blend thoroughly with sugar mixture.
Pat into 8-inch square pan, and bake at 350 Ã‚Â°F. 15 minutes.
Sprinkle with quartered maraschino cherries.
Beat egg whites until frothy; add cream of tartar, and beat until soft peaks form.
Gradually add 1 1/4 cups brown sugar, and continue beating until stiff.
Fold in vanilla.
Spread me-ringue evenly over baked layer, and bake 25 minutes at 350Ã‚Â°F.
When cool cut into 24 squares.