Preheat the oven to 350℉.
Line two baking sheets with parchment paper or put two silicone mats aside.
Place vanilla, vanilla cake mix, melted butter, and eggs in a large mixing bowl of a stand mixer that has been fitted with the flat beater attachment. Beat on low until well combined.
Fold in the white chocolate chips at low speed. If you don't have a stand mixer you can mix everything together with a spatula and mixing bowl.
Using a small cookie scoop or spoon, drop 1 ½ tablespoon sized balls onto the baking sheets. Leave a few inches in between them as the cookies will spread as they bake.
Bake the cookies at 350℉ for 8-10 minutes or until the tops are set. Cool the cookies completely on the baking sheets before decorating.
While the cookies are baking, make snowman heads. Melt 1-2 tablespoons of the white chocolate wafers.
Create small spaces for the eyes, nose, and mouth using a toothpick or skewer on the marshmallows. Quickly place the tiny chocolate chips and orange sprinkles in the openings before the white chocolate dries. You can use tweezers or your hands to do this. Whichever is easier. (If you want to add cute earmuffs, if you have the time and patience, use Twizzlers and M&M’s. You do have to hold them in place until they dry so this may take some time.)
Once all the cookies have cooled enough to decorate, melt the chocolate melting wafers in the microwave.
Measure half a tablespoon of melted chocolate and pour over the cookies. If some of the chocolate drips down the sides of the cookie it is fine. The objective is to make the snowman appear to be melting. You can break this portion of the decorating up into batches so that the chocolate does not dry before decorating. This will also reduce your chances of adding too much white chocolate as it is very sweet.
Add the rest of the snowman's body parts; head, pretzel arms, M&M buttons, and Twizzler scarf. Once these have been applied, let the chocolate set for 10-20 minutes before serving. To speed it up this process, you can place the cookies in the fridge