In the mixing bowl of a Stand Mixer, add the Butter, Sugar, and Egg, and blend with the Whisk attachment until smooth, and creamy.
Add the Vanilla, and mix until blended.
In a separate bowl, add the Flour, and Salt, and mix well to blend.
Add the Flour mixture to the mixing bowl, and mix until blended, and smooth.
Add several drops of the Green Food Coloring Gel, and using the Paddle attachment, mix the food coloring into the dough, on low speed. Add a little more Food Coloring Gel if needed, to achieve the bright Green color.
Place a large piece of Parchment paper on the Kitchen Counter, and sprinkle with Flour.
Place half of the Cookie dough on the Parchment paper, and with a Floured Rolling Pin, roll the Dough to 1/2 inch thickness.
Using the Thumbprint Cookie Cutter, cut out the Cookies. Continue until all the dough has been rolled, and all the cookies have been cut out.
Place on a Parchment paper lined Cookie Sheet.
Bake at 350 degrees for 10 to 12 minutes, or until Cookies being to turn golden brown around the edges.
Remove from oven to a wire rack, and cool completely.
When cookies are cool; place about 4 squares of the White Chocolate Almond Bark in a microwave safe dish/bowl, and microwave for about 1 minute, stopping at 10 second intervals to stir the White Chocolate.
When the Chocolate is melted, remove from Microwave, and add several drops of the Food Coloring, made especially for Chocolate, until the desired color of Green is achieved for the Frosting.
Frost the center of the Cookies with the Frosting, and place a Red Grinch Heart in the middle of the Frosting.
Frost around the edges of the cookies, using the back of a spoon.
Place Cookies on a wire rack, or Parchment paper until the Chocolate is set/firm, about an hour.
Serve cookies and Enjoy!