Skor: Stir 2 chopped 39-g Skor bars into flour mixture. Continue with recipe.
Toblerone: Push a piece of Toblerone into each scored square before baking.
Lemon: Stir 1 tbsp lemon zest into flour mixture. Continue with recipe. Whisk 3/4 cup sifted icing sugar with 3 tbsp lemon juice until smooth. Lightly brush over cooled cookies, over a cooling rack. Excess icing will drip through the rack. Let stand 1 hour or until dry.
Chocolate: Instead of 1/3 cup rice flour, sift together 3 tbsp rice flour and 3 tbsp cocoa powder. Continue with recipe. Drizzle cooled cookies with melted chocolate.
From the kitchen of Julia Black (assistant home editor).