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A dozen freshly baked Shamrock Sugar Cookies decorated with green icing and sprinkles on a white plate.

Ultimate Shamrock Sugar Cookies

This is the ultimate recipe for tender, sweet, and perfectly shaped cut-out sugar cookies, specifically designed for St. Patrick's Day shamrocks. The dough holds intricate shapes beautifully and can be decorated with simple sparkling sugar or smooth royal icing for a festive treat. It's a foolproof, workhorse recipe perfect for sharing luck and cheer.
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Prep Time 1 hour 30 minutes
Cook Time 10 minutes
Total Time 1 hour 40 minutes
Servings: 24
Course: Dessert, Snack
Cuisine: American
Calories: 180
Ingredients Equipment Method Notes

Ingredients
  

  • 1/2 teaspoon baking powder
  • 1/2 teaspoon salt
  • 1 large egg
  • 1 large egg yolk
  • 2 teaspoons pure vanilla extract
  • Green gel food coloring
  • For Simple Decoration: Green coarse sugar or sparkling sugar
  • For Royal Icing: 2 cups 240g

Equipment

  • Stand mixer or hand mixer
  • Mixing bowls
  • Whisk
  • Measuring cups and spoons
  • Plastic wrap
  • Rolling Pin
  • Shamrock-shaped cookie cutter (or heart cutter substitute)
  • Baking sheets
  • Parchment paper
  • Wire cooling rack
  • Disposable gloves (optional, for coloring dough)

Method
 

  1. In a medium bowl, whisk together the flour, baking powder, and salt. Set aside.
  2. In the bowl of a stand mixer fitted with the paddle attachment (or using a hand mixer), cream the softened butter and granulated sugar together on medium-high speed for 2-3 minutes, until pale and fluffy.
  3. Add the whole egg, egg yolk, and vanilla extract. Mix on medium speed until fully combined, scraping down the sides of the bowl as needed.
  4. With the mixer on low speed, gradually add the dry flour mixture. Mix just until a soft dough forms and no dry flour remains.
  5. Add several drops of green gel food coloring to the dough. Knead the dough by hand (wear gloves to avoid staining) until the color is completely uniform.
  6. Divide the dough in half. Flatten each half into a disc, wrap tightly in plastic wrap, and refrigerate for at least 1 hour (and up to 2 days).
  7. Preheat oven to 350°F (175°C). Line baking sheets with parchment paper.
  8. On a lightly floured surface, roll one disc of chilled dough to a consistent 1/4-inch thickness. Keep the other disc refrigerated.
  9. Dip your shamrock cookie cutter in flour and cut out shapes. Place cookies on the prepared baking sheets, about 1 inch apart. Re-roll scraps once.
  10. For simple decoration: Lightly brush cookie tops with water, milk, or beaten egg white and sprinkle generously with green coarse sugar.
  11. Bake for 8-10 minutes, or until the edges are just set. The centers should not brown.
  12. Let cookies cool on the baking sheet for 5 minutes, then transfer to a wire rack to cool completely before decorating with royal icing, if using.
  13. For Royal Icing: Whisk powdered sugar, meringue powder, and 3 tablespoons water until smooth and thick. Divide and tint with gel coloring. For outlining, use icing as-is. For flooding, thin portions with tiny drops of water until it flows like honey. Outline cookie edges, then flood the interior. Let dry completely, for several hours or overnight.

Notes

Use gel food coloring, not liquid, to avoid altering the dough's moisture. Chilling the dough is essential to prevent cookie spread. If cookies spread, chill the cut shapes on the baking sheet in the freezer for 5 minutes before baking. No shamrock cutter? Use a small heart cutter: arrange three hearts with points touching and add a dough rectangle for a stem. Store fully decorated cookies in a single layer in an airtight container at room temperature for up to a week, or freeze for up to 3 months. For a flavor twist, add 1 teaspoon mint extract with the vanilla, or sprinkle flaky sea salt on iced cookies.