01 -
Preheat oven to 175°C. Line a 23x23 cm pan with parchment paper and coat lightly with non-stick spray.
02 -
Using an electric mixer, beat softened butter with granulated sugar until light and fluffy, about 1 minute.
03 -
Mix in egg and vanilla extract, beating until fully combined.
04 -
Gradually add flour, baking powder, and salt into wet mixture, mixing until a thick batter forms.
05 -
Fold in crushed peppermint candy evenly throughout the batter without overmixing.
06 -
Press batter evenly into prepared pan. Bake for 20 minutes or until the top is golden brown and set.
07 -
Remove pan from oven and let bars cool completely in the pan.
08 -
Lift cooled cookie bar slab by edges of parchment paper and set onto a work surface.
09 -
Beat powdered sugar, softened butter, salt, extract, and milk on medium speed until frosting is creamy and fluffy.
10 -
Spread frosting evenly over cooled bars and sprinkle generously with additional crushed peppermint candy.
11 -
Allow frosting to firm up before slicing into squares. Serve as desired.