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Cinnamon Shortbread Sandwich Cookies with Eggnog Buttercream

Cinnamon Shortbread Cookies with Eggnog Buttercream sparkle with creamy eggnog buttercream sandwiched between crisp, crumbly shortbread cookies sandwich.
Prep Time20 minutes
Cook Time15 minutes
Finishing10 minutes
Total Time45 minutes
Course: Cookies, Dessert, Sweets
Keyword: Christmas Cookies, Cinnamon Shortbread, Cookies, Eggnog, Eggnog Buttercream, Shortbread Cookies
Servings: 21 Sandwich Cookies
Calories: 200kcal

Ingredients

  • 2 Cups All-Purpose Flour
  • 1 Pinch Salt
  • 1 TBSP Cinnamon
  • 1 Cup Butter Softened, Salted
  • Cup Brown Sugar Packed

Dusting Sugar Mixture

  • ½ Cup Sugar
  • 2 TSP Cinnamon

Eggnog Buttercream

  • 2 Cups Confectioner's Sugar
  • 2 TBSP Salted Butter Melted
  • 1 TSP Vanilla
  • ¼ TSP Ground Cinnamon
  • ¼ Cup Eggnog + 1 TBSP

Instructions

  • Preheat the oven to 325°F. Prepare two cookie sheets with silicone baking mats or parchment paper.
  • In a medium bowl, combine flour, cinnamon, and salt. Set aside.
  • In a stand mixer, cream together butter and sugar for about 2-3 minutes.
  • Add in the flour mixture in small increments until mostly combined. Transfer the dough to a floured surface and knead until well incorporated and not crumbly.
  • In a small bowl, combine ½ cup of sugar and two teaspoons of cinnamon and mix together.
  • Using a tablespoon, scoop a leveled measuring spoon of cookie dough and roll into balls.
  • Roll cookie balls into the sugar cinnamon mixture until well coated and place on prepared cookie sheet.
  • Using the bottom of a water glass, smoosh the dough balls to about a ½ inch thick disc. Space cookies about 1 inch apart, as these do not spread much while baking.
  • Using the tines of a fork, pierce two rows of holes about halfway down through the cookies.
  • Continue until one sheet of cookies is complete. Refrigerate the cookies for 15 minutes prior to baking.
  • Bake the cookies for 13-15 minutes, until the edges are just golden brown. Be cautious to not overbake.
  • Allow to cool for 5 minutes on the cookie sheet and then move to a cooling rack to cool completely.
  • While the first cookie sheet chills and then bakes, prepare the second sheet of cookies to cool while the first bakes.

Eggnog Buttercream

  • Combine all ingredients together, setting aside the 1 TBSP of eggnog and whip together with a hand mixer.
  • Add the additional TBSP of eggnog in increments, mixing throughout to get buttercream to desired consistency. Buttercream should be the consistency of peanut butter.
  • Spread a generous amount of buttercream onto one cookie and sandwich with a second.
  • Store cookies in an airtight container for up to one week.