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["Sift flour, cornstarch, baking powder and salt into a large bowl. Whisk a few times; set aside. In the bowl of an electric stand mixer whip butter, shortening and sugar on medium speed until pale and fluffy; about 4 minutes. Scrape down sides of bowl and mixing paddle as needed. Add in egg and mix until well combined. Add in remaining egg white, vanilla and almond extract and mix thoroughly. With mixer running on medium-low, slowly add in dry ingredients and mix just to incorporate. Transfer dough to an airtight container and refrigerate 2 hours.", "", "Pre-heat oven to 375 degrees F during the last 10 minutes of refrigeration.", "", "Scoop dough out an even 1/4 cup at a time, or portion with a scale (mine were about 64 grams each), and roll into a ball. Place dough ball on lightly floured surface, sprinkle top lightly with flour. Flatten dough to 1/2"" thick using a smooth, flat object (cookie will be about 2 5/8"" - 2 3/4"" after flattening). Transfer cookie to a parchment lined, or buttered cookie sheet and repeat process with remaining dough (use 2 cookie sheets). Bake in pre-heated oven for 9 - 11 minutes, until centers just puff, and do not indent when lightly touched. Allow cookies to cool 5 minutes on baking sheet before removing to a wire rack to cool. Cool completely. Frost and decorate."]
