In the mixing bowl of a stand mixer, add the Cake Mix, Eggs, Powdered Sugar, Oil, and Water, and mix on low speed until combined.  Scrape down the sides of the mixing bowl, and mix at high speed for 1 minute. 

Next, add the Lime Green Food Coloring a few drops at a time until the desired color is achieved.  Remove the mixing bowl from the stand, and gently fold in the White Chocolate Chips. 

Line the bottom of a 9 X 9 inch dish with Parchment paper, and pour the batter into the dish. 

Bake at 350 degrees for 25 to 30 minutes, or until a toothpick inserted in the center comes out clean.  Remove from oven to a wire rack to cool completely. 

While the Brownies are cooling, make the Frosting.

In the mixing bowl of a stand mixer, add the Butter, Milk, and Vanilla, and blend at low speed until mixed.  Add the Powdered Sugar a little at a time until all is added, and well blended, smooth and creamy. 

Add a few drops of the Lime Green Food Coloring until desired color is reached. 

When the Brownies are cool, Frost with the Frosting, and sprinkle with the Red Hearts.

Serve and Enjoy!