01 -
Preheat oven to 350°F (175°C) and line a baking sheet with parchment paper.
02 -
Cream together butter, granulated sugar, and brown sugar until smooth.
03 -
Beat in the egg and vanilla until well combined.
04 -
Mix in the flour, baking powder, and salt.
05 -
Scoop 7-8 balls of dough, roll into balls, then roll in sprinkles.
06 -
Flatten the dough balls to about 3/4-inch thickness.
07 -
Bake for 12-13 minutes until lightly golden. Let cookies cool on the baking sheet for 10 minutes before transferring to a wire rack.
08 -
Cream the butter until smooth, then add powdered sugar, vanilla, and heavy cream. Beat on low for 2 minutes.
09 -
Add butterscotch syrup and beat on high for 4 minutes until fluffy.
10 -
Pipe the buttercream onto cooled cookies in a spiral starting from the center. Top with sprinkles immediately.