These soft and chewy frosted sugar cookie bars are an easy way to make about 24 thick, tender cookies in one 9 x 13-inch pan. The buttery sugar cookie dough takes about 15 minutes to prepare, bakes at 375°F for 10–12 minutes, and is finished with a creamy American buttercream frosting.
Every square has lightly golden edges, a soft center, and a sweet vanilla finish beneath a smooth layer of frosting. The secret is removing the bars while the center still looks slightly pale and soft, because they continue baking in the hot pan and stay chewy as they cool.
Jump to RecipeWhy You’ll Love This Recipe
There is something especially comforting about a frosted sugar cookie, but scooping and rolling individual cookies can take time. These bars deliver the same classic buttery vanilla flavor with far less effort because the entire batch is pressed into one pan.
The texture is the main attraction. The edges become just lightly golden while the middle stays thick, soft, and pleasantly chewy. A generous layer of American buttercream adds a creamy contrast without hiding the delicate flavor of the cookie base.
This recipe is also wonderfully adaptable for holidays, birthdays, school treats, bake sales, and casual weekend desserts. Use pastel frosting for spring, bright colors for celebrations, or simple white frosting and sprinkles for a classic bakery look.
If you enjoy simple, practical baking ideas, you may also like this easy four-ingredient cookie idea for another quick treat.
Ingredients You’ll Need
The cookie dough starts with softened unsalted butter and granulated sugar. Creaming these ingredients together creates a light, smooth base and helps distribute the sugar throughout the dough.
- Butter: Use 1 cup, or 226 grams, softened to room temperature. It should be pliable but not melted.
- Granulated sugar: One cup provides sweetness and helps create the familiar lightly crisp edge.
- Egg and vanilla: One large egg binds the dough, while 1 teaspoon of vanilla adds warm flavor.
- Dry ingredients: Use 2 1/2 cups all-purpose flour, 1/2 teaspoon baking powder, and 1/2 teaspoon salt.
- Buttercream: The frosting needs 1/2 cup softened butter, 2 cups powdered sugar, 1 teaspoon vanilla, and 2–3 tablespoons milk or heavy cream.
- Decorations: A few drops of food coloring and sprinkles are optional but make the bars festive.
For a seasonal dessert table, a small bowl of pumpkin pie spice sugar can inspire a fall-themed topping idea, although the cookie bars themselves use the vanilla ingredients listed above.
How to Make It Step-by-Step
Step 1: Heat the oven to 375°F (190°C), then prepare a 9 x 13-inch baking pan. Line it with parchment paper for easy lifting, or lightly grease the pan so the bars release neatly after cooling.
Step 2: Add the softened butter and granulated sugar to a large mixing bowl. Beat for about 2–3 minutes, scraping the bowl once or twice, until the mixture looks noticeably lighter and fluffy.
Step 3: Beat in the large egg and vanilla extract. Mix just until the egg disappears into the butter mixture; avoid prolonged mixing once the wet ingredients are combined.
Step 4: In a separate bowl, whisk together the all-purpose flour, baking powder, and salt. Add this mixture gradually to the wet ingredients, mixing only until no obvious streaks of flour remain.
Step 5: Transfer the thick dough to the prepared pan. Lightly grease your hands or place a sheet of parchment over the dough, then press it firmly and evenly into all four corners for a consistent thickness.
Step 6: Bake for 10–12 minutes. The top should look set and the edges should be very lightly golden, while the center may still look slightly pale and soft.
Step 7: Leave the pan on a cooling rack and let the cookie slab cool completely. This usually takes about 30–45 minutes, and the cooling time is important because warm bars can cause the buttercream to melt.
Step 8: Make the frosting by beating the softened butter until smooth. Gradually add the powdered sugar, then add the vanilla and 2 tablespoons of milk or cream; add the final tablespoon only if the frosting needs to become more spreadable.
Step 9: Add a few drops of food coloring if desired, then spread the buttercream over the cooled cookie bars. Finish with sprinkles, lift the slab from the pan if using parchment, and cut it into about 24 squares.
Pro Tips for Soft, Chewy Bars
The most important tip is to watch the oven closely during the final minutes. Sugar cookie bars can go from soft to dry quickly, so remove them when the center still appears a little underdone rather than waiting for the whole surface to turn golden.
Always begin with softened butter, not melted butter. Soft butter creams properly with the sugar, while melted butter can make the dough greasy and change the final texture.
Measure the flour carefully. If using measuring cups, spoon the flour into the cup and level it instead of scooping directly from the bag, which can pack in too much flour and make the bars firm.
Press the dough evenly into the pan. Uneven thickness can leave thin corners overbaked while the center is still soft. Lightly greased hands make the sticky, dense dough much easier to spread.
For the smoothest frosting, sift the powdered sugar if it contains visible lumps. Add the liquid gradually because a frosting that is too loose can slide across the bars instead of forming a neat, creamy layer.
For another comforting breakfast or brunch recipe to serve alongside a dessert spread, try these soft soufflé pancakes with caramelized bananas.
Frosting, Decorating, and Cutting Ideas
American buttercream is ideal here because it is quick to make, easy to tint, and sturdy enough for party desserts. Vanilla keeps the flavor traditional, but the frosting can be colored to match a birthday theme, baby shower, graduation, or holiday gathering.
Spread the frosting with a small offset spatula for a smooth finish, or create gentle swirls for a homemade look. Add sprinkles immediately after frosting so they adhere before the buttercream forms a crust.
For clean cuts, chill the frosted bars briefly if the buttercream feels soft, then use a sharp knife. Wipe the blade between cuts for tidy squares with distinct layers of cookie, frosting, and decoration.
Keep the toppings simple if you want the buttery cookie flavor to stand out. Rainbow sprinkles are cheerful, while sanding sugar, tiny sugar pearls, or seasonal sprinkles can change the appearance without changing the recipe.
Storage and Serving Suggestions
Store the frosted bars in an airtight container at room temperature for a short serving window, provided your kitchen is not especially warm. Arrange parchment between layers if stacking them so the frosting stays neat.
They can also be refrigerated when you need to keep them longer or when the buttercream is soft. Let chilled bars sit at room temperature briefly before serving so the cookie texture becomes tender again and the frosting is creamy.
For the best presentation, cut the bars just before placing them on a platter. They are excellent for lunchbox treats, cookie trays, potlucks, and make-ahead dessert tables because one pan creates many portions.
If you are planning a larger meal around these cookies, balance the sweet finish with savory sides such as apple sage stuffing muffins, or add a bright salad dressed with this honey orange balsamic vinaigrette.
Soft and Chewy Frosted Sugar Cookie Bars
Ingredients
Method
- Heat the oven to 375°F (190°C). Line or lightly grease a 9 x 13-inch baking pan.
- Cream the softened butter and granulated sugar with a mixer for 2-3 minutes, until light and fluffy.
- Beat in the egg and vanilla extract until evenly incorporated.
- Whisk the flour, baking powder, and salt in a separate bowl. Gradually add the dry ingredients to the butter mixture, mixing only until combined.
- Press or spread the thick dough evenly into the prepared pan using lightly greased hands or parchment paper.
- Bake for 10-12 minutes, just until the top is set and the edges are very lightly golden. Cool completely in the pan.
- For the frosting, beat the softened butter until smooth. Gradually add the powdered sugar, then beat in the vanilla and enough milk or cream to make a smooth, spreadable frosting.
- Tint the frosting if desired, spread it over the cooled bars, add sprinkles, and cut into squares.
Notes
Final Thoughts
Soft and chewy frosted sugar cookie bars are the kind of dependable dessert that looks festive without demanding complicated techniques. The thick pan-baked cookie stays tender when you avoid overbaking, and the simple buttercream provides just the right amount of sweetness.
Prepare the dough, press it evenly into the pan, and trust the slightly pale center as your signal to remove it from the oven. Once the bars cool completely, frost, sprinkle, slice, and enjoy a homemade cookie treat that is easy to share.