Gather the ingredients - * Butter * Green gel food coloring * Sugar * Egg yolk * Vanilla extract * Flour * Baking powder * Candy hearts
– Add the softened butter and green food coloring to the bowl of a stand mixer fitted with the paddle attachment. – Beat on medium speed until the butter has turned green.
– Add the sugar, egg yolk, and vanilla. Mix to combine. – Add the flour and baking powder. Mix just until combine.
Roll out the dough on a lightly floured surface and cut out 2" circles. Place them on a parchment lined baking sheet and freeze for 1 hour.
– Bake the cookies for 13-15 minutes. – Remove the cookies from the oven and immediately place a candy heart in the center of each one. Press the candy heart gently into the cookie until it sticks.
– Allow the cookies to cool on a baking sheet until they are room temperature. – Store any leftover cookies in an airtight container at room temperature for up to three days.