01 -
Whip together the butter, sugar, and pudding powder until fluffy.
02 -
Stir in the egg until it's fully worked into the mixture.
03 -
Gradually add the salt and flour until dough forms.
04 -
Sandwich the dough between two parchment sheets, roll to 1/8 inch, and freeze for 20 minutes.
05 -
Use a cutter for circles, remove centers from half, then refreeze.
06 -
Pop into a 350°F oven for 6–8 minutes, until just firm.
07 -
Mix milk, confectioners' sugar, butter, and vanilla until light and creamy.
08 -
Spread filling on uncut cookies and cap with cut-out cookies.
09 -
Sprinkle green sugar into the cutouts and shake off any extra.