Scotch Shortbread
["1 1/2 c. all-purpose flour", "1/2 tsp. salt", "1/2 c. butter", "1/2 c. confectioners sugar"]
["Sift flour, measure, add salt and sift again.", "Cream butter, gradually add confectioners sugar and beat until light.", "Combine dry ingredients and creamed mixture.", "Blend thoroughly.", "Put dough in 8 x 8-inch pan and bake at 325\u00b0 for 25 to 30 minutes.", "Cut in squares before completely cool."]
["flour", "salt", "butter", "confectioners sugar"]