“Words with Friends” Cookies

Make the cookies: Preheat the oven to 350 ºF and lightly flour your work surface. Sift together the flour and baking powder. Set it aside. In the bowl of a stand mixer fitted with the paddle attachment, cream together the sugar and butter. Add the egg, and then add the vanilla extract. Add the flour mixture to the butter mixture in thirds and beat it just until combined making sure to scrape down the sides of the bowl as needed. Transfer the dough to the lightly floured surface and roll it until it's about 1/4-inch thick all over. Using a pizza cutter or sharp knife, cut the dough into small squares measuring about 3/4-inch on all sides. Transfer the squares to a parchment paper-lined baking sheet and bake the cookies for 6 to 8 minutes until they're pale golden brown. Transfer the cookies to a cooling rack, and while the cookies cool, make the frosting. Make the royal icing: In the bowl of an stand mixer fitted with the whisk attachment, beat the egg whites with the lemon juice until combined. Add the sifted confectioners sugar in batches and beat on "low" until combined and the frosting has a smooth texture. Add the yellow food coloring, 1 teaspoon at a time, until you achieve your desired color. Transfer the icing to the pastry bag then pipe the icing onto the cookies, starting by piping a border around each square and then filling in the center. If you're not using the icing immediately, transfer it to an airtight container, as it will harden when exposed to air. Once the yellow icing has dried fully, melt the chocolate in a microwave, stirring until smooth. Transfer the melted chocolate to a pastry bag and pipe on your desired letters and corresponding numbers. Allow the chocolate to harden fully then serve.