Name: Shamrock Shake Sugar Cookie Bars
Prep time: 20 min
Cook time: 14 min
Total time: 34 min
Yield: 24
Cuisine: American
Ingredients: 1/2 cup unsalted butter, softened; 1/2 cup brown sugar; 1/2 cup granulated sugar; 1 large egg; 1/2 teaspoon vanilla extract; 1/2 teaspoon mint extract; 2 1/2 cups all purpose flour; 1 teaspoon baking powder; 1/2 teaspoon salt; green gel color; 1/2 cup unsalted butter, softened; 1/2 teaspoon vanilla extract; 1/2 teaspoon mint extract; 1/4 teaspoon salt; 3 1/2 cups powdered sugar; 6 Tablespoons heavy whipping cream; green sanding sugar; 1 - 10 ounce jar maraschino cherries with stems

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These soft mint Shamrock Shake Sugar Cookie Bars are a fun and easy treat for St. Patrick's Day. White frosting, green sugar, and a cherry make this sugar cookie bar recipe look like the popular McDonald's shamrock shake.

A square of Shamrock Shake Sugar Cookie Bars with white frosting, green sugar, and a maraschino cherry on a white doily with more bars behind it

Ok, so I realized that I just shared a sugar cookie bar with you recently. But this weekend I was scrolling through Facebook, and I saw a few different posts for shamrock shakes.

Want to know something? I don't think I have ever had one before. Can you believe that? Please tell me I am not the only one. I've been too busy making and drinking a Homemade Mint Latte instead.

And in 8 years of blogging I have never made any sort of shamrock dessert. I'm definitely a fly by the seat of my pants kind of blogger.

Usually on a whim, I get crazy ideas for food that I can't rest until I make. This was one of those moments!

Three frosted shamrock shake sugar cookie bars stacked on top of each other with a cherry on top

Since shamrock shake recipes have been done and done again, I wanted to make a new recipe that was totally different. Something unique, but equally as delicious.

My mind went right away to these Sugar Cookie Bars. Everyone loves the bright colors, so what if I made them bright green and gave them some mint flavor?

Unsalted Butter - Make sure to set it out ahead of time, so it creams easily with the sugar. If all you have is salted, you can use that and use less salt in the recipe.
Sugars - a mixture of granulated and brown sugar give these cookie bars a chewy texture
Egg - Add structure and liquid to the recipe
Vanilla and Mint Extract - the mixture of these two extracts give this dessert the authentic McDonald's shake flavor
Flour, Baking Powder, Salt - gives the cookie bars structure, lift, and balances the flavor

Overhead picture of shamrock shake sugar cookie bars on a white tray and on a black towel

Two batches of green cookie bars and fluffy white frosting later. Green sugar and a cherry made these sugar cookie bars look like those popular shamrock shakes!

Beat the butter and sugars until light and creamy.
Add the egg and extracts and beat again.
Stir in the dry ingredients and mix until a stiff dough forms.
Add green gel food color to the dough and work in until you get the color you like.
Press the dough evenly into the bottom of a greased 9x13 pan.
Bake and cool.
Frost with vanilla buttercream frosting. Add green sanding sugar and a maraschino cherry to each one right before serving.

Tips and Tricks

Make sure you set out the butter ahead of time. Soft butter is much easier to work into cookie dough.
Use mint extract in this recipe. Peppermint is a Christmas flavor, so using that will yield a different taste. Mixing vanilla and mint extract will keep it from tasting like toothpaste!
Add the dry ingredients in slowly. The dough will be very stiff, yet crumbly.
If you use a hand mixer to make the cookie bars, you WILL need to work the dough longer. I recommend using a stand mixer with a paddle blade.
Add your green food coloring sparingly because a little bit does go a long way. Slowly add a little at a time until you get to the color you want.
Let the cookie bars cool completely before spreading on the frosting. If the cookies are warm, the frosting will melt.
Dry the cherries off with paper towels before putting them on the bars. If the cherries are wet, they will melt the green sugar and you will have a green streaky mess.

Storage

Keep the frosted cookie bars in a tightly sealed container for 4-5 days. They will actually get softer the longer they sit.

The unfrosted bars can be frozen for later. Wrap them tightly in plastic and then again in foil. Freeze for up to 2 months. Let thaw at room temperature before adding frosting and decorations.

A white tray with squares of frosted Shamrock Shake Sugar Cookie Bars topped with green sugar and maraschino cherries

More mint desserts

Other easy desserts

Recipe

Shamrock Shake Sugar Cookie Bars

Yield: 24 cookie bars

Prep Time: 20 minutes

Cook Time: 14 minutes

Total Time: 34 minutes

These soft mint Shamrock Shake Sugar Cookie Bars are a fun and easy treat for St. Patrick's Day. White frosting, green sugar, and a cherry make them look like the popular McDonald's shamrock shake.

Ingredients

For the Cookie Bars

½ cup unsalted butter, softened
½ cup brown sugar
½ cup granulated sugar
1 large egg
½ teaspoon vanilla extract
½ teaspoon mint extract
2 ½ cups all purpose flour
1 teaspoon baking powder
½ teaspoon salt
green gel color

For the Frosting

½ cup unsalted butter, softened
½ teaspoon vanilla extract
½ teaspoon mint extract
¼ teaspoon salt
3 ½ cups powdered sugar
6 Tablespoons heavy whipping cream
green sanding sugar
1 - 10 ounce jar maraschino cherries with stems

Instructions

Preheat the oven to 375 degrees. Line a 9x13 pan with foil and spray it with nonstick baking spray.
Beat the butter and sugars until creamy. Add the egg and extracts and beat again.
Add the baking powder, salt, and half the flour and mix until a soft dough forms. Add the rest of the flour and beat until mixed in. If you are using a hand mixer, you may need to use the back of a spoon or your hands to knead the dough until stiff.
Use a butter knife to add the green gel color to the desired shade. Again if using a hand mixer, it will take time to mix the color in. Using a spoon or stand mixer does work better.
Press the dough firmly and evenly into the bottom of the prepared pan. Bake for 14 minutes. Remove and cool completely.
Beat the butter, extracts, and salt until creamy. Add the powdered sugar and heavy cream alternately until everything is mixed in. Beat on high for 1-2 minutes or until light and fluffy.
Spread the frosting on top of the cooled cookie bars. Lift the foil out of the pan and cut the bars into 24 squares. Top with green sanding sugar and a cherry that has been patted dry.

Notes

Make sure the butter is soft when you start to beat the sugar.
Slowly add the dry ingredients. The dough will be stiff.
If you are using a hand mixer, you will need to mix it for a lot longer until the dough comes together.

Nutrition Information:

Yield: 24 Serving Size: 1
Amount Per Serving: Calories: 245Total Fat: 9gSaturated Fat: 6gTrans Fat: 0gUnsaturated Fat: 3gCholesterol: 32mgSodium: 94mgCarbohydrates: 39gFiber: 1gSugar: 29gProtein: 2g

Nutrition facts are an estimate and are not guaranteed to be accurate. If you need special diet advice, please see a registered dietician.

Two pictures of shamrock shake sugar cookie bars collaged together with a green text box

*The post for Shamrock Shake Sugar Cookie Bars was first published March 6, 2017. The post was updated and republished March 4, 2021.