Ingredients

The following ingredients have 4 Servings
  • 1/2 cup butter (room temperature)
  • 3/4 cup sugar
  • 1 egg
  • 1 egg yolk
  • 2 teaspoons vanilla extract
  • 1 1/2 cups flour
  • 1 1/2 teaspoons corn starch
  • 1 teaspoon baking powder
  • 1/2 teaspoon baking soda
  • 1/4 teaspoon salt
  • 1/2 cup rainbow sprinkles
  • 1/2 batch buttercream frosting
  • Food coloring and extra sprinkles for topping

Instruction

  • Preheat oven to 350-degrees.  Line a 8 or 9-inch square pan with foil. Set aside.
  • Place butter in a large mixing bowl.  Beat for 1 minute until light and creamy.
  • Add sugar to butter. Cream together until light and fluffy.
  • Add egg, egg yolk, and vanilla. Beat until combined. Set aside. 
  • In a separate bowl, add dry ingredients (flour, corn starch, baking powder, baking soda, and salt). Whisk to combine. 
  • Pour about a third of the flour mixture into the butter mixture. Mix on low until combined. Repeat twice more with the remaining flour mixture.  The mixture will be very thick.
  • Fold in sprinkles.
  • Press dough into square pan.
  • Bake at 350-degrees for about 25-26 minutes (not too long so they'll be nice and soft).
  • While sugar cookie bars are baking, prepare a half batch of buttercream according to these instructions. Dye your frosting with food coloring.
  • When bars are done cooking, allow to cool to room temperature.  Frost. Top with sprinkles and cut into 16 squares.