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Creamy Pastel Swirl Sugar Cookie Bars with Easy Vanilla Buttercream Recipe

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These creamy pastel swirl sugar cookie bars feature a soft, tender sugar cookie base with a rich vanilla buttercream frosting, creating a visually stunning and delicious treat perfect for celebrations or everyday indulgence.

Ingredients

Scale
  • 2 ¾ cups (345g) all-purpose flour
  • 1 teaspoon baking powder
  • ½ teaspoon salt
  • 1 cup (225g) unsalted butter, softened
  • 1 ½ cups (300g) granulated sugar
  • 2 large eggs, at room temperature
  • 2 teaspoons pure vanilla extract
  • ¼ cup (60ml) whole milk
  • Gel food coloring in pastel shades (pink, blue, yellow, lavender), a few drops each
  • For the Vanilla Buttercream:
  • 1 cup (225g) unsalted butter, softened
  • 3 cups (360g) powdered sugar, sifted
  • 1 ½ teaspoons pure vanilla extract
  • 2 to 3 tablespoons (30-45ml) heavy cream
  • Pinch of salt

Instructions

  1. Preheat your oven to 350°F (175°C). Grease or line a 9×13 inch baking pan with parchment paper, leaving an overhang for easy removal.
  2. In a medium bowl, whisk together the flour, baking powder, and salt. Set aside.
  3. In a large bowl, beat the softened butter and granulated sugar with an electric mixer until light and fluffy, about 3 to 4 minutes.
  4. Beat in the eggs one at a time, then stir in the vanilla extract.
  5. Gradually add the dry ingredients to the wet mixture, alternating with the milk. Mix gently until combined, being careful not to overmix.
  6. Divide the batter evenly into 4 small bowls. Add a few drops of gel food coloring to each bowl and stir gently until the color is evenly distributed.
  7. Dollop spoonfuls of each colored batter randomly into the prepared pan, layering colors on top of each other. Use a butter knife or skewer to gently swirl the colors together to create a pastel marbled effect.
  8. Bake for 28 to 32 minutes until the edges are set and golden and the center is slightly soft. A toothpick inserted should come out with a few moist crumbs but no wet batter.
  9. Allow the bars to cool completely in the pan on a wire rack.
  10. To make the vanilla buttercream, beat the softened butter until creamy. Gradually add the powdered sugar, mixing on low speed.
  11. Add vanilla extract, salt, and heavy cream. Beat on high for 3 to 4 minutes until fluffy and spreadable, adjusting cream for desired consistency.
  12. Spread the buttercream evenly over the cooled bars using an offset spatula. Optionally, create gentle peaks or swirls in the frosting.
  13. Use a sharp knife warmed under hot water and dried to cut the bars into squares or rectangles. Serve and enjoy.

Notes

Use gel food coloring for vibrant pastel colors without thinning the batter. Do not over-swirl the batter to maintain distinct pastel swirls. Use room temperature eggs and butter for better mixing. Frost only when bars are completely cooled to prevent melting. Warm the knife before slicing for clean cuts. For dairy-free or gluten-free versions, substitute ingredients accordingly.

Nutrition

Keywords: sugar cookie bars, pastel swirl, vanilla buttercream, easy dessert, celebration dessert, soft sugar cookies, creamy frosting

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