Sugar cookie bars are sweet and delicious, thanks to a thick layer of buttercream frosting. The frosting and the sprinkles can be matched to any festivity you have planned!
Preheat the oven to 350°F. Prepare a 9×13 inch pan by spraying it lightly with baking spray, lining with parchment paper and spraying again.
Add butter, sugar and vanilla bean (or paste) to large mixing bowl. Cream together using a electric hand mixer, on medium speed. Add egg yolks and mix well. Add the flour and salt; mix just until a dough forms.
Press the dough evenly into the bottom of the prepared pan.
Bake for 20 minutes or until firm and no longer shiny on top. Remove and let cool completely on a wire rack.
Meanwhile, combine all of the frosting ingredients in medium mixing bowl; whip until fluffy. Tint with gel food coloring if desired.
Spread the frosting over the cooled cookie base and immediately top with sprinkles.
Chill in the freezer for at least 30 minutes before slicing into bars and serving.
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Notes
The frosting can be tinted with gel food coloring, or left as is. Decorate with desired sprinkles or jimmies.
Substitute for vanilla bean paste: You can use pure vanilla extract or add the seeds scraped from one vanilla bean as a substitute, on a 1:1 basis (1 tablespoon vanilla bean paste=1 tablespoon vanilla extract=1 vanilla bean).