Preheat oven to 375°F (190°C). In a medium bowl, whisk together the flour, baking soda, and salt.
In a large bowl, cream together the softened butter, granulated sugar, and powdered sugar until light and fluffy. Beat in the vanilla extract and egg.
Gradually add the dry ingredients to the wet ingredients, mixing until just combined. Stir in the green food coloring until the dough is evenly colored.
Roll the dough into 1-inch balls and place them on a baking sheet lined with parchment paper.
Bake for 8-10 minutes, or until the edges are set. Remove from oven and immediately press a few red heart sprinkles into the center of each cookie.
Let the cookies cool on the baking sheet for a few minutes before transferring them to a wire rack to cool completely.
Notes
Enjoy these festive cookies with a glass of milk or hot cocoa!