Name: Peppermint Sugar Cookie Bars
Prep time: 20 min
Cook time: 20 min
Total time: 40 min
Cuisine: American
Ingredients: 1 cup unsalted butter, softened; 1 1/2 cups granulated sugar; 1 large egg; 2 teaspoons vanilla extract; 1/2 teaspoon peppermint extract; 2 3/4 cups all-purpose flour; 1 teaspoon baking powder; 1/2 teaspoon salt; 1/2 cup unsalted butter, softened, for frosting; 2 1/2 cups powdered sugar; 2 tablespoons heavy cream or milk; 1 teaspoon vanilla extract, for frosting; 1/4 teaspoon peppermint extract, for frosting; 1 pinch salt, for frosting; 1/2 cup crushed candy canes or peppermint candies; 2 tablespoons holiday sprinkles, optional

Peppermint Sugar Cookie Bars bring that bright, cozy holiday feeling into one soft, buttery dessert. They have the tender chew of a classic sugar cookie, the ease of a simple bar cookie, and a cool peppermint finish that makes every square feel festive without being fussy.

These bars are perfect for Christmas trays, cookie swaps, classroom parties, winter birthdays, or a quiet night when you want something sweet with a little sparkle. A creamy peppermint frosting spreads over the soft cookie base, then crushed candy canes add color, crunch, and that unmistakable holiday charm.

These Peppermint Sugar Cookie Bars are made for bakers who want big holiday flavor without rolling, chilling, cutting, and decorating dozens of individual cookies. The dough presses right into one pan, bakes into a soft slab, and gets finished with a dreamy frosting that looks beautiful with very little effort.

The texture is one of the best parts. The cookie layer is thick, tender, and buttery, while the frosting adds a smooth, creamy contrast. The crushed peppermint candies bring a crisp little bite on top, so each square feels balanced instead of overly sweet.

They also travel well once the frosting has set. That makes them a smart choice for dessert tables, edible gifts, bake sales, office treats, or any December gathering where you want something pretty, easy to slice, and crowd-friendly.

Peppermint Sugar Cookie Bars give you the same soft sugar cookie flavor, but they skip the most time-consuming parts of cookie baking. Instead of scooping several trays, rotating pans, and waiting for batches to cool, you spread the dough into one baking dish and cut everything after it bakes.

They are also easier to decorate evenly. A single layer of frosting gives every bite the same creamy peppermint finish, while the crushed candy canes scatter across the top like holiday confetti. You still get the homemade cookie experience, but the process feels much more relaxed.

Another advantage is consistency. Bar cookies are less likely to overbake around the edges of each individual cookie, and the center stays soft when you pull the pan from the oven at the right time. That means fewer dry cookies and more tender, bakery-style squares.

Each ingredient has a simple job in these Peppermint Sugar Cookie Bars, and together they create a soft cookie base, creamy frosting, and festive peppermint topping.

Unsalted butter gives the cookie bars their rich flavor and soft, tender bite. It also helps the frosting whip into a smooth, spreadable layer.

Granulated sugar sweetens the cookie base and helps create that classic sugar cookie flavor. It also supports the soft, lightly chewy texture.

Egg adds structure and moisture, helping the bars hold together neatly once sliced.

Vanilla extract rounds out the sweetness and gives the cookie base a warm bakery-style aroma.

Peppermint extract brings the cool holiday flavor. A little goes a long way, so it should taste refreshing rather than sharp.

All-purpose flour forms the body of the cookie bars. It keeps the bars sturdy enough to slice while still staying soft.

Baking powder gives the cookie base a gentle lift so the bars are not dense or heavy.

Salt balances the sweetness and makes the butter and peppermint flavors stand out.

Powdered sugar creates a smooth frosting that spreads easily over the cooled cookie layer.

Heavy cream or milk loosens the frosting and helps it become fluffy and creamy.

Crushed candy canes or peppermint candies add sparkle, crunch, and a stronger peppermint finish on top.

Holiday sprinkles are optional, but they make the bars extra cheerful for parties and cookie platters.

Making Peppermint Sugar Cookie Bars is simple because the cookie dough bakes in one pan, then the cooled bars are frosted and decorated before slicing.

Step 1: Prepare the Pan

Heat the oven to 350°F. Line a 9×13-inch baking pan with parchment paper, leaving a little overhang on the sides so you can lift the bars out later. Lightly grease any exposed parts of the pan to prevent sticking.

Step 2: Cream the Butter and Sugar

In a large mixing bowl, beat the softened butter and granulated sugar until the mixture looks light and fluffy. This step helps build a soft texture, so give it enough time to become creamy rather than simply mixed.

Step 3: Add the Egg and Flavorings

Beat in the egg, vanilla extract, and peppermint extract. Scrape down the sides of the bowl so everything blends evenly. The peppermint should smell fresh, but not overpowering.

Step 4: Mix the Dry Ingredients

In a separate bowl, whisk together the flour, baking powder, and salt. This helps the leavening and salt spread evenly through the dough, so the bars bake with a consistent texture.

Step 5: Bring the Dough Together

Add the dry ingredients to the butter mixture and mix just until a soft dough forms. Avoid overmixing once the flour goes in, because too much mixing can make the bars tougher instead of tender.

Step 6: Press and Bake

Press the dough evenly into the prepared pan. Use lightly floured fingers or a spatula to smooth the top. Bake until the edges are barely golden and the center looks set. The bars should stay soft, so do not wait for the entire top to brown.

Step 7: Cool Completely

Let the cookie base cool fully in the pan. Frosting warm bars can melt the butter in the frosting and make the topping slide around, so patience matters here.

Step 8: Make the Peppermint Frosting

Beat the softened butter until creamy, then add powdered sugar, a splash of cream or milk, vanilla extract, peppermint extract, and a pinch of salt. Beat until smooth and fluffy. Add a little more cream if the frosting feels too thick.

Step 9: Frost and Decorate

Spread the frosting over the cooled cookie base in an even layer. Sprinkle crushed candy canes and sprinkles over the top while the frosting is still soft so they stick nicely.

Step 10: Slice Into Bars

Lift the bars from the pan using the parchment overhang. For clean cuts, chill the frosted bars briefly, then slice with a sharp knife. Wipe the knife between cuts if you want neat bakery-style squares.

Peppermint Sugar Cookie Bars are best served in neat squares once the frosting has had a little time to set. A 9×13-inch pan usually makes about 24 bars, depending on how large you cut them. For a dessert table with several sweets, smaller squares work well and can feed closer to 30 people. For a single dessert option, plan on about 18 to 24 servings.

Serve them at room temperature for the softest cookie texture and creamiest frosting. They look especially pretty on a white platter, a wooden board, or tucked into holiday cookie boxes with parchment between layers.

For a festive dessert spread, pair them with hot cocoa, coffee, peppermint tea, or a cold glass of milk. They also make a fun addition to a Christmas cookie tray because the red and white candy topping stands out next to chocolate cookies, shortbread, gingerbread, and fudge.

If you are gifting them, let the frosting firm up first. Then place the bars in a single layer or separate stacked layers with parchment paper so the topping stays clean.

Store Peppermint Sugar Cookie Bars in an airtight container at room temperature for up to 2 days if your kitchen is cool. Keep parchment between layers so the frosting does not stick to the bars above it.

For longer storage, refrigerate them for up to 5 days. Chilling helps the frosting stay firm and keeps the peppermint topping fresh. Let the bars sit at room temperature for about 15 to 20 minutes before serving so the cookie base softens again.

You can also freeze the unfrosted cookie base. Wrap it tightly in plastic wrap, then place it in a freezer-safe bag or container for up to 2 months. Thaw in the refrigerator overnight, bring to room temperature, then frost and decorate before serving.

Freezing fully frosted bars is possible, but the crushed candy canes may become sticky or slightly melty once thawed. For the prettiest finish, freeze the baked base only and add the frosting and candy topping fresh.

Frequently Asked Questions

Can I make Peppermint Sugar Cookie Bars ahead of time?

Yes, these bars are a great make-ahead dessert. Bake the cookie base one day in advance, cover it tightly once cool, and frost it the next day. You can also frost the bars several hours before serving. For the freshest candy cane crunch, add the crushed peppermint topping closer to serving time if possible.

Can I use salted butter instead of unsalted butter?

You can use salted butter if that is what you have. Reduce the added salt in the cookie base and frosting so the bars do not taste overly salty. Unsalted butter gives you more control, but salted butter still works well in a casual holiday bake.

How do I keep the bars soft?

The biggest secret is not overbaking. Pull the pan from the oven when the edges are lightly golden and the center looks set. The bars will continue to firm as they cool. Storing them in an airtight container also helps lock in moisture.

Can I make these bars without peppermint extract?

Yes. You can skip the peppermint extract in the cookie base and use it only in the frosting, or leave it out completely for classic frosted sugar cookie bars. Crushed candy canes on top will still give a light peppermint flavor.

Why did my candy cane topping get sticky?

Crushed candy canes can absorb moisture from frosting or humid air. To reduce stickiness, add the candy topping shortly before serving, store the bars in a cool place, and keep the container tightly covered. A mix of sprinkles and candy canes can also help the topping look pretty even if some peppermint pieces soften.

Want More Holiday Dessert Ideas?

If you love these Peppermint Sugar Cookie Bars, you’ll probably enjoy these other festive sweets from Life With Mira:

• Winter Wonderland Chocolate Chip Christmas Cookies for a cheerful cookie tray favorite with cozy chocolate flavor.

• Soft Pumpkin Snickerdoodles with Cinnamon Sugar when you want a soft cookie with warm spice and fall-to-winter comfort.

• Red Velvet Cheesecake Brownies for a rich, colorful dessert that looks beautiful on a celebration table.

• Oreo Stuffed Cinnamon Rolls if you want a fun, sweet treat that feels special enough for a holiday morning.

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I would love to hear how your bars turned out. Did you add extra crushed candy canes, keep the frosting simple, or cut them into tiny cookie tray bites? Share your version in the comments so we can all bake a little smarter and sweeter.

Peppermint Sugar Cookie Bars