Soft Sugar Cookie Bars Recipe

I can never resist these Sugar Cookie Bars because the sour cream makes them unbelievably soft, moist, and bakery-worthy. One pan delivers thick, frosted cookie perfection for parties, holidays, or any sweet craving.

I’m obsessed with these Soft Sugar Cookie Bars because they hit that sweet spot between bakery-style sugar cookie and thick frosted bar. I love how the sour cream keeps every bite soft, tender, and seriously moist without making the bars feel heavy.

And the frosting? I could swipe it straight from the pan with a spoon.

These are the bars I want for birthdays, holidays, random Tuesdays, or any time I need something sweet that actually delivers. But the real pull is the texture: dense enough to slice clean, soft enough to melt.

Big cookie energy. Zero fuss.

All sugar cookie joy.

Ingredients

• All purpose flour gives the bars structure, so they’re soft but not cakey.
• Baking powder and baking soda help them puff up just enough.
• Salt keeps the sweetness from tasting flat.

  Tiny thing, big job.

• Softened butter makes the cookie base rich, tender, and honestly kind of irresistible.
• Granulated sugar brings sweetness and that classic sugar cookie vibe.
• Brown sugar adds a little chew and a cozy, caramel-ish flavor.
• The egg holds everything together, so the bars don’t crumble everywhere.
• Vanilla makes it taste homemade, even before the frosting shows up.
• Sour cream keeps the bars moist and soft for days.

  Basically magic.

• Powdered sugar makes the frosting smooth, fluffy, and sweet without being gritty.
• Butter in the frosting gives it that creamy bakery-style feel.
• Milk or cream loosens the frosting so it spreads like a dream.
• Plus, sprinkles make them party-ready with zero extra effort.

Ingredient Quantities

• 2 1/4 cups all purpose flour
• 1 teaspoon baking powder
• 1/2 teaspoon baking soda
• 1/2 teaspoon salt
• 1 cup unsalted butter softened (2 sticks)
• 3/4 cup granulated sugar
• 1/2 cup packed light brown sugar
• 1 large egg
• 1 teaspoon vanilla extract
• 1/2 cup sour cream
• 2 cups powdered sugar for frosting
• 6 tablespoons unsalted butter softened for frosting
• 2 to 3 tablespoons milk or heavy cream for frosting
• 1/2 teaspoon vanilla extract for frosting
• Pinch of salt
• Sprinkles for decorating, optional

How to Make this

1. Preheat oven to 350 degrees F and line a 9×13 inch baking pan with parchment paper or lightly grease it.

2. In a medium bowl whisk together 2 1/4 cups all purpose flour, 1 teaspoon baking powder, 1/2 teaspoon baking soda, and 1/2 teaspoon salt; set aside.

3. In a large bowl or mixer cream 1 cup softened unsalted butter with 3/4 cup granulated sugar and 1/2 cup packed light brown sugar until light and fluffy.

4. Add 1 large egg and 1 teaspoon vanilla extract to the creamed butter and beat until combined.

5. Stir in 1/2 cup sour cream until evenly incorporated.

6. Fold the dry ingredients into the wet ingredients just until combined, being careful not to overmix.

7. Spread the batter evenly into the prepared pan and bake 20 to 25 minutes, or until the edges are set and a toothpick in the center comes out with a few moist crumbs.

8. Cool the bars completely in the pan on a wire rack before frosting.

9. For the frosting beat 6 tablespoons softened unsalted butter with 2 cups powdered sugar, 1/2 teaspoon vanilla extract, a pinch of salt, and 2 to 3 tablespoons milk or heavy cream until smooth and spreadable; add more milk or powdered sugar to adjust consistency if needed.

10. Spread the frosting over the cooled bars, decorate with sprinkles if desired, then slice into squares and serve.

Equipment Needed

1. 9×13 inch baking pan
2. Parchment paper or nonstick spray
3. Oven
4. Medium and large mixing bowls
5. Electric mixer or hand whisk
6. Measuring cups and spoons
7. Rubber spatula and wooden spoon
8. Wire cooling rack

FAQ

Soft Sugar Cookie Bars Recipe Substitutions and Variations

• All purpose flour: use a 1 to 1 gluten free baking blend that contains xanthan gum for structure, or substitute whole wheat pastry flour cup for cup and expect a slightly denser, nuttier crumb.
• Unsalted butter (for dough): swap with solid coconut oil measured 1 to 1 for a subtle coconut note, or use vegetable shortening 1 to 1 for a tender, less flavorful result.
• Sour cream: replace with plain Greek yogurt cup for cup for similar tang and moisture; drain regular yogurt briefly if thinner.
• Powdered sugar (for frosting): make your own by blitzing granulated sugar with 1 tablespoon cornstarch per cup until powdered, or use store bought confectioners sugar as labeled.

Pro Tips

– Let the baked bars cool completely before frosting. If the pan is even slightly warm the frosting will melt and slide, turning your neat squares into a gooey mess.

– For extra tender crumb, fold the dry ingredients into the wet just until no streaks of flour remain. Overmixing develops gluten and makes the bars dense.

– If your frosting is too stiff, add milk or cream a teaspoon at a time until it spreads easily. If it becomes too thin, whisk in a little more powdered sugar until it holds shape.

– To get clean, pretty slices, chill the frosted pan for 20 to 30 minutes, then use a sharp knife warmed in hot water and wiped dry between cuts.