Name: Peppermint Sugar Cookie Bars
Prep time: 15 min
Cook time: 20 min
Total time: 35 min
Yield: 8 Servings
Cuisine: American

Real Life of Lulu Verified

January 22, 2026

These Peppermint Sugar Cookie Bars are the perfect mix of sweet and minty with a soft sugar cookie base and creamy peppermint frosting. They’re a holiday favorite, but honestly, they’re just as good any time of the year when you’re craving something fun and festive. Easy to make and totally delicious, they’re a treat everyone will love!

From the Cook

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Peppermint Sugar Cookie Bars

Real Life of Lulu Verified

Ingredients

WarningMilk and 5 other allergens identified

Instructions

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Instructions

Preheat the oven to 350℉.

Spray a 9x9-inch baking dish with non-stick cooking spray or line with parchment paper. Set aside.

In a large mixing bowl, combine the sugar and butter. Beat with a mixer until it is light and fluffy.

Add the egg and vanilla and beat again.

Add the salt, baking powder, and about half the flour. Beat until combined.

Add the rest of the flour and beat until a batter forms.

Stir in the crushed peppermints until combined.

Pour and scrape the batter into the prepared 9×9 baking dish.

Spread the batter around evenly. If it's really thick, you might need to use your hand to spread it.

Bake at 350℉ for 20-25 minutes.

Let the bars cool completely in the baking dish on a wire rack.

Once cooled completely, spread with peppermint frosting (see below).

Frosting

In a large mixing bowl, mix the powdered sugar, butter, peppermint extract, vanilla extract, and milk until a frosting forms.

Spread the frosting on top of the cookie bars evenly.

Let the frosting set (at least 30 minutes) before cutting into squares.

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Tips & Tricks (5)

Crush Candy Uniformly 🍬
Use a food processor or rolling pin to crush peppermint candies into consistent, fine pieces for even distribution and a more professional presentation in your cookie bars.
Extract Balance Technique 🌿
When adding peppermint extract, start with half the recommended amount and taste, as it can quickly become overpowering and ruin the delicate sugar cookie flavor.
Room Temperature Ingredients 🌡️
Ensure butter and eggs are at room temperature before mixing to create a smoother, more homogeneous batter that results in a more tender and consistent cookie bar texture.
Frosting Chill Trick ❄️
After applying the peppermint frosting, refrigerate the bars for 15-20 minutes to help the frosting set and make cutting into clean, sharp squares much easier.
Even Baking Hack 📏
Use parchment paper with slight overhang and smooth the batter into the corners with an offset spatula to ensure uniform thickness and prevent dry edges.