01 -
Preheat oven to 350°F. Line baking sheet with parchment.
02 -
Melt butter, stir in sugar, egg yolks, vanilla and green coloring until combined.
03 -
Mix in flour, baking soda and salt just until dough forms.
04 -
Divide dough into 12 balls, roll in sugar and place on baking sheet.
05 -
Bake 10-11 minutes until spread and crackled. Add hearts while warm.
06 -
Let rest 2 minutes on sheet then transfer to wire rack.