Preheat your oven to 350°F (175°C).
In a bowl, whisk together the flour, baking soda, and salt.
In a separate large bowl, cream the softened butter, granulated sugar, and brown sugar until fluffy.
Beat in the eggs, one at a time, then add vanilla extract.
Gradually mix in the dry ingredients until just combined.
Add green food coloring until the desired shade is reached.
Roll dough into balls and place them on a baking sheet lined with parchment paper.
Bake for 10-12 minutes until edges are lightly golden.
Let cookies cool on the baking sheet for a few minutes, then transfer to a wire rack.
Once cooled, decorate with royal icing, candy hearts, and edible eyes.