This tray of Christmas sugar cookie bars has been my holiday go-to for years. I first developed this version on a hectic December weekend when I wanted the bright flavor of a classic sugar cookie without rolling, chilling, and cutting dozens of individual cookies. The result is a thick, tender bar with a slightly crisp edge, a soft, cakey center, and a creamy frosting that sets into a sliceable top. It delivers all the nostalgia of cut-out cookies — buttery mouthfeel, vanilla-forward sweetness, and crunchy sprinkles — but in one pan that feeds a crowd.

I remember carrying a warm pan to a neighborhood cookie swap one year; people kept asking if I had actually rolled and cut every cookie by hand. The short answer: no. These bars look festive, slice beautifully, and travel well. The dough uses pantry staples and comes together quickly in a bowl. The frosting uses a touch of cream cheese for richness and tang, cutting through sweetness so each bite feels balanced. Whether you’re bringing them to a potluck, packing them in lunchboxes, or leaving a plate out for Santa, they always disappear fast.

Ingredients

• Salted butter (for the bars): 1 stick (1/2 cup) softened — choose a high-quality brand like Land O'Lakes or Kerrygold for richer flavor; do not melt, just bring to room temperature so it creams properly.
• Granulated sugar: 1 cup — provides structure and slight chew; measure by leveling the cup for consistent results.
• Large egg: 1 — at room temperature for smoother incorporation and even texture.
• Vanilla extract: 1 teaspoon — use pure vanilla if you can; it makes a noticeable difference versus imitation.
• All-purpose flour: 2 cups — spoon into the cup and level off to avoid dense bars; brands like King Arthur yield reliable results.
• Baking powder: 1 teaspoon — the small lift keeps the center tender rather than flat.
• Festive sprinkles: 1/4 cup — use non-pariel or jimmies that won’t bleed color when baked; fold in gently to avoid streaking.
• Powdered sugar (for frosting): 2 cups — sift if lumpy to make a silky frosting.
• Salted butter (for frosting): 1 stick (1/2 cup) softened — matches the base and gives a cohesive buttery flavor.
• Cream cheese: 3 tablespoons softened — adds tang and smoothness; Philadelphia brand is reliable.
• Vanilla extract (frosting): 1 teaspoon — balances the powdered sugar.
• Milk: 2 tablespoons — use whole milk for a richer frosting or a splash more if you prefer a spreadable consistency.
• Additional sprinkles: for decorating the top — pick colors that match your theme.

Instructions

Preheat and prepare pan: Preheat the oven to 350°F and line a 9" x 9" baking pan with parchment paper, leaving an overhang for easy removal. Grease the parchment lightly with butter or nonstick spray so the bars lift cleanly. Cream butter and sugar: Using a stand mixer or hand mixer, beat 1/2 cup softened butter and 1 cup sugar on medium speed until pale and fluffy, about 2–3 minutes. Proper creaming traps air that helps with texture; scrape the bowl once to ensure even mixing. Add egg and vanilla: Beat in the room-temperature egg and 1 teaspoon vanilla until fully incorporated. The batter will be glossy at this stage — if the egg seems to separate, continue beating a bit longer; the emulsion will come together. Incorporate dry ingredients: With the mixer on low, add 2 cups all-purpose flour and 1 teaspoon baking powder a little at a time until a thick dough forms. Avoid overmixing once the flour is added to prevent toughness; stop as soon as you have a uniform dough. Fold in sprinkles and press into pan: Gently stir in 1/4 cup festive sprinkles with a spatula. Transfer the thick dough to the prepared pan and press evenly into the corners — damp hands or a piece of parchment on top helps smooth the surface without sticking. Bake and cool: Bake at 350°F for about 20 minutes, or until the top is lightly golden and a toothpick inserted into the center comes out with a few moist crumbs. Cool completely in the pan on a wire rack, then use the parchment overhang to lift from the pan before frosting. Make the frosting: Beat together 2 cups powdered sugar, 1/2 cup softened butter, and 3 tablespoons softened cream cheese until smooth. Add 1 teaspoon vanilla and 2 tablespoons milk; beat until creamy. Adjust milk by teaspoonfuls for desired spreadability. Frost and decorate: Spread the frosting generously over the cooled bars and scatter additional sprinkles on top. For cleaner slices let frosting set in the fridge 10–20 minutes; for softer tops serve immediately.

Storage Tips

To preserve texture and flavor, store frosted bars in a single layer in an airtight container in the refrigerator; they’ll keep well for up to 5 days. If you need to stack layers, separate them with parchment to prevent sticking. For longer storage, freeze unfrosted bars wrapped tightly in plastic wrap and foil for up to 3 months; thaw overnight in the refrigerator, then frost the next day. To refresh a chilled bar before serving, let it sit at room temperature for 15–20 minutes so the frosting softens slightly and the flavors bloom.

Ingredient Substitutions

If you need dairy-free options, swap the butter for a firm vegan butter and replace cream cheese with a plant-based cream-cheese alternative; note texture and flavor will be slightly different. For egg-free baking, use a commercial egg replacer or 3 tablespoons unsweetened applesauce — expect a slightly denser crumb. To reduce sugar, substitute half the granulated sugar with a cup-for-cup brown sugar alternative or use a granulated erythritol blend; the bars will be less crisp and slightly more hydrated. Gluten-free flours can be used in a 1:1 blend formulated for baking (e.g., Bob's Red Mill 1-to-1); add a teaspoon of xanthan gum if the blend doesn't include it for structure.

Serving Suggestions

Serve bars warm with a scoop of vanilla ice cream for an indulgent dessert or slice into smaller squares for a cookie platter. They pair beautifully with hot chocolate, mulled cider, or a bright cranberry-orange punch. For afternoon tea, garnish each square with a small mint leaf and a dusting of extra powdered sugar. These bars also make charming gifts: stack slices in a decorative box separated by parchment and tie with a ribbon for a homemade holiday present.

Cultural Background

Traybakes and sheet-style sweets are a longstanding tradition in many households because they maximize flavor while minimizing labor. These bars borrow the essence of classic sugar cookies — rooted in European holiday baking — and translate it into an American traybake format that’s perfect for modern entertaining. Using frosting and sprinkles to signal holidays is a contemporary twist; historically, sugar cookies were often cut into shapes and iced for celebrations, so these bars carry that same festive spirit with easier execution.

Seasonal Adaptations

Change sprinkles and frosting colors to match seasons: peppermint crunch and white sanding sugar for Christmas, pastel sprinkles and lemon zest in spring, or warm spices like cinnamon and nutmeg for a fall twist. For a summertime version, fold in mini chocolate chips and top with a thin glaze instead of cream cheese frosting. Holiday add-ins like finely chopped candied ginger or orange zest can also be stirred into the dough for a seasonal flavor boost without altering technique.

Meal Prep Tips

Bake several pans at once during a dedicated holiday-baking session and freeze the unfrosted bars. Thaw in the refrigerator the night before you need them, then frost and decorate on the day of serving for the freshest presentation. Cut bars into uniform squares using a ruler as a guide, and store pre-sliced bars separated by parchment in an airtight container for grab-and-go treats that work well for packed lunches or gift boxes.

These sugar cookie bars have become a quiet holiday tradition in my home — simple to make, impossible to resist. Whether you keep them classic or personalize them with unique toppings, they bring that cozy, festive feeling to any table. Bake a pan, share with friends, and watch how quickly they become a new favorite.