Can you tell me how to make Michelle Obama’s Citrus Shortbread Cookies?
Here's a recipe for Michelle Obama’s Citrus Shortbread Cookies:

Ingredients:

• 3 sticks unsalted butter
• 1 1/2 cups caster sugar, divided, plus 2 tablespoons
• 2 large egg yolks
• 2 tablespoons amaretto
• 1 teaspoon lemon zest
• 1 teaspoon orange zest
• 3 cups cake flour
• 1/4 teaspoon kosher salt
• 1 large egg white, beaten

Instructions:

1. Preheat the oven to 325°F (170°C). Grease a 17 x 12 x 1-inch (43 x 30 x 2.54 cm)+ baking sheet with nonstick spray and line with parchment paper.
2. In a large bowl, cream together the butter and 11/2 cups of caster sugar with an electric hand mixer on medium speed until smooth. Add the egg yolks and beat until fluffy.
3. Add the amaretto, lemon zest, and orange zest and beat until just combined.
4. Gradually add the flour and salt and mix on low speed until no dry spots remain, being careful not to overwork the dough.
5. Spread the dough evenly on the prepared pan, making sure the top is as smooth as possible. Brush the dough with the egg white, then sprinkle with the remaining 2 tablespoons of sugar.
6. Bake for 20–25 minutes, or until golden brown. Turn off the oven and let the cookies cool inside for 15 minutes, then remove from the oven and cut while slightly warm.
7. Serve immediately.

Enjoy your Michelle Obama’s Citrus Shortbread Cookies!