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Easy Mermaid Cookies: Little Mermaid Birthday Party Idea

These Mermaid Cookies are so cute yet easy to make! They would be perfect for any mermaid-themed party, especially a Little Mermaid birthday party. 

Rather than using a mermaid-shaped sugar cookie cutter, we decided to create an ocean wave on a colorful cookie, topped with a mermaid tail. While these cookies look fancy, they actually are simple to make!

We used neon food coloring gel to create the pretty, vibrant colors that look just like a mermaid. And the frosting has just a touch of tropical flavor that you would find at the ocean.

No matter when you decide to serve them, these cookies are sure to make a splash with your guests!

Want more mermaid party ideas? Check out these crafts:

Mermaid Tail Cookie Recipe

Makes approximately 40 cookies.



  • 2 Sticks of Butter, softened
  • 1 cup Sugar, plus additional for decorative purposes
  • 1 Tablespoon Vanilla
  • 1 Egg
  • 3 cups Flour
  • 1 Tablespoon Baking Powder
  • Neon Green Food Coloring Gel
  • Bright Aqua Blue Food Coloring Gel



Using the whisk attachment in a standing mixing bowl, add the butter, sugar, vanilla, and egg. Blend until light and fluffy.  

Add about half of the tube of Neon Green food coloring gel and several drops of the bright Aqua food coloring gel. Mix well to blend the colors and make it bright, but leave some streaks in the dough for the color variations.  

In a separate bowl, add the flour and baking powder. Stir until blended.  Add the flour in a little at a time and mix on low to blend until all of the flour is added.  

Remove the whisk attachment and use the paddle, continuing to blend the dough until a smooth ball starts to form. Scrape down the sides as needed.

Line two cookie sheets with parchment paper.

Roll the cookie dough into small, 1-inch balls. Place the balls on the parchment paper. Bake at 350 degrees for about 15 minutes, or just until the cookies start to turn a light golden brown around the edges.  

About half way through the baking time (around 7-8 minutes), check the cookies to see if they have started to crack a little bit. If so, remove the cookies from the oven.

Then take a flat bottom glass, dip it in sugar and then gently and lightly press down on each cookie to flatten it. This will give the cookies a crinkled look. Put the cookies back in the oven to finish baking another 7-8 minutes.

When the cookies are done, remove from the oven. Transfer to a wire rack to cool completely.

To make the frosting, add the butter and cream cheese in a bowl in the stand mixer and blend to combine.

Next, add the vanilla and heavy cream and mix. Add in the powdered sugar a little at a time, blending after each addition, until the frosting is smooth and fluffy.  

Add the Neon Aqua and Green food coloring gels to the frosting. Be sure that the color is a bit more aqua blue than the cookie color. Finally, add one drop of the pineapple flavoring into the frosting and stir to blend together.

Using a large whipped cream piping tip, pipe the frosting onto the cookies using a swirling motion and finishing off by bringing it up to a point.  

Place one mermaid tails in the frosting on each cookie.  Allow the frosting to set up for about 30 minutes before serving.