This tray of sugar cookie bars became my household's Christmas shortcut the first December I needed a dessert I could bake, frost and transport without juggling dozens of cut-out cookies. I wanted the classic sugar-cookie flavor — buttery, sweet, with a clean vanilla finish — but in a format that slices neatly for cookie exchanges and potlucks. These bars deliver the tender chew of a perfectly baked sugar cookie with the convenience of a sheet cake: mix in one bowl, press into a pan, bake, cool, frost and decorate.

I discovered this combination while adapting a favorite cut-out dough into an easier holiday crowd-pleaser. With a touch of powdered sugar folded into the dough and a generous vanilla buttercream, the texture is soft and almost cakey at the center while edges stay lightly crisp. The red and green jimmy sprinkles folded into the dough and sprinkled atop the frosting add that unmistakable Christmas cheer — they melt slightly into the surface but retain bright color and crunch. Every year these bars disappear first at family gatherings; they’re simple enough for a weekday bake and celebratory enough for the holiday table.

Ingredients

• Granulated sugar (3/4 cup): Provides bulk sweetness and helps create tender crumb; use standard white cane sugar such as Domino or C&H for consistent results.
• Powdered sugar in dough (1/4 cup): Adds fine tenderness to the dough and helps mimic rolled sugar cookie texture without chilling; sifted is best to avoid lumps.
• Unsalted butter, softened (3/4 cup): Room-temperature butter blends easily; choose a quality brand like Land O Lakes or Plugra for richer flavor. Soft but not melted is ideal.
• Vanilla extract (2 tsp): Pure vanilla extract lifts the whole flavor; if possible use 1 tsp pure extract and 1 tsp vanilla bean paste for flecks and aroma.
• Large eggs (2): Add structure and moisture; bring to room temperature for smoother emulsion and even baking.
• Baking powder (1 tsp) and salt (1/2 tsp): Provide gentle lift and flavor balance — use aluminum-free baking powder for cleaner taste.
• All-purpose flour (2 1/4 cups): King Arthur or Pillsbury work well; spoon into measuring cup and level for accuracy to avoid dry bars.
• Red and green jimmy sprinkles (3 tbsp): Folded into the dough and scattered on top for festive color; add a few extra for decorating after frosting.
• Frosting: Powdered sugar (2 1/4 cups), unsalted butter plus 2 tbsp softened (about 5/8 cup total), 3–4 tbsp heavy cream or milk, 1/8 tsp salt and 1 1/2 tsp vanilla for a smooth, spreadable finishing layer. Use heavy cream for a richer mouthfeel or milk for a lighter option.

Instructions

Step 1 — Preheat and prepare the pan:Preheat the oven to 350°F. Line a 9x13-inch baking pan with parchment paper leaving a 1-inch overhang on two sides; this helps lift the bars out cleanly. Lightly grease the parchment or pan edges with butter to prevent shifting.Step 2 — Cream butter and sugars:In a large mixing bowl, beat the softened butter with 3/4 cup granulated sugar and 1/4 cup powdered sugar on medium speed until pale and fluffy, about 2–3 minutes. Scrape the bowl frequently. Proper creaming traps air that yields a tender crumb; do not overheat or melt the butter.Step 3 — Add eggs and vanilla:Add the eggs one at a time, mixing until incorporated, then stir in the 2 teaspoons vanilla. If the mixture looks slightly curdled, continue mixing — once flour is added it will come together.Step 4 — Combine dry ingredients:Whisk the 2 1/4 cups all-purpose flour with 1 teaspoon baking powder and 1/2 teaspoon salt in a separate bowl. Gradually add the dry ingredients to the butter mixture on low speed until just combined; avoid overmixing to keep bars tender.Step 5 — Fold in sprinkles and press into pan:Fold 3 tablespoons of red and green jimmy sprinkles into the dough by hand. Turn the dough into the prepared pan and use an offset spatula or your fingertips (lightly floured) to press an even layer across the pan, smoothing the top for even baking.Step 6 — Bake until set:Bake at 350°F for 14–18 minutes until the edges are lightly golden and the center is set but still pale. An inserted toothpick should come out with a few moist crumbs; avoid browning the top, which changes the classic sugar-cookie flavor to toasted.Step 7 — Cool and prepare the frosting:Let the pan cool on a rack for 20–30 minutes. Meanwhile, beat 2 1/4 cups powdered sugar with the softened 1/2 cup plus 2 tablespoons butter, 1 1/2 teaspoons vanilla, 1/8 teaspoon salt and 3–4 tablespoons heavy cream until smooth and spreadable. Start with 3 tablespoons cream and add more if you prefer a thinner spread.Step 8 — Frost, decorate and slice:Spread an even layer of frosting over the cooled bars using an offset spatula. Scatter additional sprinkles on top before the frosting sets. Chill briefly in the refrigerator to firm the frosting, then lift the bars from the pan using the parchment overhang and slice into 24 bars with a sharp knife or bench scraper.

Storage Tips

Store frosted bars in a single layer at room temperature for up to 48 hours, covered loosely with plastic wrap to prevent frosting damage. For longer keeping, refrigerate in an airtight container for up to 5 days; bring to room temperature before serving for best flavor and texture. If freezing, freeze unfrosted bars flat on a sheet pan first until firm, then wrap individually in plastic and pack into a freezer bag. Thaw in the refrigerator overnight and frost the next day, or thaw and frost at room temperature for 1–2 hours.

Ingredient Substitutions

Want to change the profile? Swap half the all-purpose flour for 1 cup whole wheat pastry flour for a nuttier note, though the bars will be slightly denser. Use light olive oil or a neutral oil in place of some butter for a softer crumb, but reduce to 1/2 cup oil and add 1 extra tablespoon powdered sugar to retain structure. For dairy-free, use vegan butter and a plant-based milk; texture will be slightly different and frosting may require more powdered sugar to stiffen. To cut sugar, reduce the granulated sugar to 2/3 cup and increase powdered sugar in the dough by 1 tablespoon to keep tenderness.

Serving Suggestions

Serve these bars alongside mulled cider, hot chocolate or coffee for a cozy presentation. For a holiday dessert platter, alternate them with gingerbread cookies and peppermint bark for color contrast. Garnish each bar with a tiny mint leaf or edible gold dust for special occasions. They also pair nicely with a scoop of vanilla ice cream for a warm-and-cold treat when served shortly after gentle reheating.

Cultural Background

Sugar cookies are an Americanized adaptation of simple European butter cakes and sugar-dusted biscuits, elevated into holiday icons by the tradition of cutting shapes and decorating. Turning the dough into bars is a modern convenience — many bakers have used sheet-baked versions for decades to serve larger crowds quickly. The bright red and green sprinkles echo Christmas palettes; historically such colors and decorative techniques became popular with mass-produced sprinkles in the 20th century, making festive baking more accessible.

Seasonal Adaptations

To adapt across seasons, change sprinkles and extracts: use orange zest and cinnamon with toasted pecans for autumn, pastel sprinkles and lemon zest for spring brunch, or swap the vanilla for peppermint extract at Christmastime for a minty twist. Add freeze-dried fruit powder to the frosting for a natural color and flavor boost. For holiday variations, drizzle melted dark chocolate on top or press crushed candy canes into the frosting.

Meal Prep Tips

These bars are excellent for batch prep. Make the dough up to 24 hours ahead and refrigerate in an airtight container; pressing and baking can be done the next day. Frost the day of serving for optimal texture, or freeze baked unfrosted bars and frost after thawing. Use a bench scraper and a sharp knife dipped in hot water between cuts for clean edges when portioning into uniform servings for lunches, bake sales or catering trays.

These bars have become a holiday shorthand in my kitchen — easy enough for a weekday bake, celebratory enough for Christmas morning. I hope they become part of your seasonal rotation and bring as much warmth to your table as they have to mine.