Sugar Cookie Bars – Soft Chewy Frosted Bakery Treats

Imagine cutting into a thick, ultra-soft sugar cookie bar loaded with festive rainbow sprinkles and piled high with a thick layer of creamy, whipped vanilla buttercream. These bakery-style Sugar Cookie Bars deliver all the nostalgic flavor and buttery sweetness of classic cutout sugar cookies with none of the hassle of rolling pins, cookie cutters, or multi-pan baking. If you are searching for a fast, family-friendly dessert that feeds a crowd and stays amazingly soft for days, you have found the dream recipe. Let’s head straight down to see how quickly these sweet frosted bars come together today!

Why You’ll Love This Recipe

• Incomparably Soft & Chewy Crumb: Cornstarch, an extra egg yolk, and softened butter create a dense, melt-in-your-mouth bakery texture.
• No Rolling or Chilling Required: Simply press the one-bowl dough directly into an 8-inch pan and bake in one quick batch.
• Fluffy Whipped Buttercream: A luscious topping of real butter, confectioners’ sugar, and rich vanilla spreads smoothly across the cooled bars.
• Fun & Festive Presentation: Loaded with vibrant rainbow sprinkles, making them an instant crowd-pleaser for parties and celebrations.
• Perfect for Any Gathering: Ideal for birthday dessert spreads, holiday cookie platters, summer cookouts, and school bake sales.

Ingredients

Cookie Bars:

• 1 and 1/2 cups (188g) all-purpose flour (spooned & leveled)
• 1 teaspoon baking powder
• 1/4 teaspoon baking soda
• 1 and 1/2 teaspoons cornstarch
• 1/4 teaspoon salt
• 1/2 cup (8 Tbsp; 113g) unsalted butter, softened to room temperature
• 3/4 cup (150g) granulated sugar
• 1 large egg + 1 egg yolk, at room temperature
• 2 teaspoons pure vanilla extract
• 1/4 teaspoon almond extract (optional)
• 6 Tablespoons (60g) rainbow sprinkles (not nonpareils)*

Vanilla Buttercream:

• 3/4 cup (12 Tbsp; 170g) unsalted butter, softened to room temperature
• 2 and 1/4 cups (270g) confectioners’ sugar
• 3 Tablespoons (45ml) heavy cream or half-and-half*
• 1 teaspoon pure vanilla extract
• pinch of salt, to taste
• optional: gel food coloring (I used 1 drop red) and extra sprinkles

How To Make Sugar Cookie Bars Step by Step

1. Prep Oven and Whisk Dry Mix

Preheat your baking oven to 350°F (175°C), line an 8×8-inch or 9×9-inch baking pan with parchment paper, and whisk 1 and 1/2 cups (188g) all-purpose flour (spooned & leveled), 1 teaspoon baking powder, 1/4 teaspoon baking soda, 1 and 1/2 teaspoons cornstarch, and 1/4 teaspoon salt in a medium bowl.

2. Cream Butter, Sugar, and Eggs

In a large mixing bowl, beat 1/2 cup (8 Tbsp; 113g) unsalted butter, softened to room temperature and 3/4 cup (150g) granulated sugar for 2 minutes until creamy, then beat in 1 large egg + 1 egg yolk, at room temperature, 2 teaspoons pure vanilla extract, and 1/4 teaspoon almond extract (optional) until smooth.

3. Fold Flour and Sprinkles

Fold dry flour mixture into creamed butter on low speed just until combined, then gently fold in 6 Tablespoons (60g) rainbow sprinkles (not nonpareils)* with a rubber spatula.

4. Press and Bake

Press the thick dough evenly into the prepared pan using your hands or the back of a measuring cup, and bake at 350°F for 20 to 22 minutes until edges are lightly golden; let cool completely in the pan on a wire cooling rack.

5. Beat Vanilla Buttercream

In a mixing bowl, beat 3/4 cup (12 Tbsp; 170g) unsalted butter, softened to room temperature for 2 minutes until light, then beat in 2 and 1/4 cups (270g) confectioners’ sugar, 3 Tablespoons (45ml) heavy cream or half-and-half*, 1 teaspoon pure vanilla extract, pinch of salt, to taste, and optional: gel food coloring (I used 1 drop red) and extra sprinkles until fluffy.

6. Frost, Garnish, and Slice

Spread the buttercream generously over the fully cooled cookie base, scatter extra sprinkles over top, and use the parchment paper overhang to lift and slice into clean bakery squares.

Tips For The Best Sugar Cookie Bars

• Do Not Skip the Cornstarch: Adding cornstarch softens the flour proteins, creating an ultra-plush, tender crumb that stays soft for days.
• Use Jimmie Sprinkles: Use cylinder-style rainbow jimmies rather than tiny round nonpareils; round sprinkles bleed their colors and turn the dough muddy.
• Do Not Overbake the Bars: Take the pan out of the oven when the edges are just barely set and golden; the center will settle into dense, chewy perfection as it cools.
• Cool Completely Before Frosting: Let the cookie slab reach full room temperature before spreading the buttercream so the butter frosting does not melt.
• Use an Extra Egg Yolk: The extra egg yolk adds rich moisture and fat, preventing the thick bars from becoming dry or cakey.

Variations

• Creative Homemade Dessert Bar Ideas: Add this colorful party classic to your favorite collection of Homemade Dessert Bar Ideas.
• Decadent Desserts With Frosting Feature: Satisfy sweet cravings whenever you want bakery-worthy Desserts With Frosting.
• Dependable Bake Sale Recipes Easy Collection: Pack and share neat squares for school events using these Bake Sale Recipes Easy.

Storage Instructions

• Fridge: Keep sliced frosted bars stored in an airtight container in the refrigerator for up to 1 week.
• Freezer: Freeze unfrosted baked bars or frosted sliced squares wrapped tightly in plastic wrap and aluminum foil for up to 3 months; thaw overnight in the fridge.
• Reheat: Enjoy chilled directly from the refrigerator, or let slices sit at room temperature for 15 minutes to soften the buttercream.

Serving and Pairing Ideas

• Serve colorful frosted bars alongside a scoop of rich vanilla bean ice cream or sweet dairy whipped cream.
• Pair your sweet afternoon dessert with a hot mug of decaf black coffee, a warm espresso, or herbal chamomile tea.
• Serve with a cold glass of whole dairy milk, creamy oat milk, or a tall glass of iced strawberry lemonade.

Frequently Asked Questions

Why is an extra egg yolk used in the dough?

Egg yolks provide rich natural emulsifiers and dairy fat without adding the drying proteins found in egg whites. Adding an extra egg yolk ensures the bars bake into a chewy, dense, melt-in-your-mouth consistency rather than a light sponge cake.

Can I bake these in a 9×13-inch pan?

This specific recipe is tailored for an 8×8-inch or 9×9-inch square pan to yield thick, bakery-style bars. If you wish to bake in a standard 9×13-inch pan, simply double all ingredients and bake for approximately 22 to 25 minutes.

Why did my sprinkles bleed color into the dough?

Color bleeding happens when nonpareils (tiny round candy balls) are used instead of jimmies, or if the dough was mixed too vigorously after adding sprinkles. Gently fold jimmies in with a spatula at the very end to keep colors bright.

How do I get clean, sharp slices?

Chill the frosted bars in the refrigerator for 30 minutes before cutting. Use the parchment paper overhang to lift the entire slab onto a cutting board, then wipe a large chef’s knife clean with a warm, damp paper towel between each slice.

Ready to Make It?

There is truly nothing quite like slicing into a batch of fresh, homemade sugar cookie bars topped with a cloud of creamy vanilla buttercream and colorful sprinkles. This simple recipe transforms classic kitchen pantry basics—flour, leaveners, cornstarch, butter, sugars, eggs, pure vanilla, almond extract, cream, and sprinkles—into an unforgettable bakery masterpiece that your whole family will love sharing. We hope you have an absolutely wonderful time making these sweet party treats in your kitchen this week! Go ahead and save this recipe to your favorite birthday baking, holiday cookie, and easy dessert boards on Pinterest so it is always ready for your next celebration.

More Easy Dessert Recipes You’ll Love

• Strawberry Ice Cream – Creamy Frozen Dessert.
• Peach French Toast Bake – Sweet Breakfast Casserole.
• Homemade Vanilla Ice Cream – Classic Dessert Base.
• Pistachio Lush – No-Bake Creamy Dessert.

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