a close up of a sugar cookie bar with a bite taken out resting on a table

Sugar Cookie Bars

Ultra soft Sugar Cookie Bars are frosted with a thick, fluffy layer of buttercream, topped with decorative sprinkles, and baked in a pan for an easy dessert perfect for all occasions! 

Course Dessert, gluten free dessert
Cuisine American
Keyword bars, buttercream, frosting, gluten free, soft, sugar cookie
Prep Time 15 minutes
Cook Time 25 minutes
Total Time 40 minutes
Servings 12
Calories 412 kcal


  • 1/2 cup butter, softened
  • 3/4 cup sugar
  • 1 egg + 1 egg yolk, room temperature
  • 2 teaspoon vanilla extract
  • 1/4 teaspoon salt
  • 1 teaspoon baking powder
  • 1/2 teaspoon baking soda
  • 1 1/2 teaspoon cornstarch
  • 1 1/2 cups all-purpose flour, or gluten free flour (My preferred brand is Cup 4 Cup gluten free flour)
  • 1/2 cup rainbow sprinkles (NOT nonpareils)

Buttercream Frosting:

  • 3/4 cup butter, softened
  • 2 1/4 cup powdered sugar
  • 3 tablespoon heavy cream
  • 1 teaspoon vanilla extract
  • pinch of salt
  • food coloring, optional
  • extra sprinkles for decorating top
US Customary - Metric


  1. Preheat oven to 350ºF. Spray a 8 X 8 baking pan with cooking spray and set aside.
  2. In a large bowl cream together the butter and sugar together until very pale, light, and fluffy, about 3 minutes. Beat in egg, yolk, and vanilla until well mixed. 
  3. To the bowl add salt, baking powder, baking soda, and cornstarch. Mix well. Gradually add the flour on low speed until just combined. The dough will be very thick. Stir in sprinkles.
  4. Press into the prepared baking pan and bake for 25 minutes (about 5 - 10 minutes longer if using gluten free flour) until a toothpick inserted in middle comes clean. The bars will be lightly browned. Allow the bars to cool completely on wire rack before frosting. They will sink slightly in the middle as they cool.

Buttercream Frosting:

Tip: This makes a very thick layer of frosting (which I have no problem with!), but if you'd prefer a thinner layer, half the recipe.

  1. In a large bowl beat the butter until light and creamy. Add the powder sugar, heavy cream, vanilla, and pinch of salt gradually on low speed until mixed in. Increase mixer to high and beat until very light and fluffy, about 7 minutes. Tip: Beating for a long time is what makes this frosting extremely fluffy. Mix in food coloring, if using.


Recipe Notes

Tips for Making The Best Sugar Cookie Bars

Adapted from Sally's Baking Addiction

Nutrition Facts
Sugar Cookie Bars
Amount Per Serving
Calories 412 Calories from Fat 189
% Daily Value*
Total Fat 21g 32%
Saturated Fat 13g 65%
Cholesterol 69mg 23%
Sodium 270mg 11%
Potassium 58mg 2%
Total Carbohydrates 53g 18%
Sugars 40g
Protein 2g 4%
Vitamin A 13.3%
Calcium 2.7%
Iron 4.5%
* Percent Daily Values are based on a 2000 calorie diet.